Develop Reference

Automatically selected the first record

I created a C#.NET program to load the table to grid control. But, when I select a record in the grid control it automatically selects the first record. When I select the second time I can get the data in the correct row. I mentioned the code below.
Please help me to solve this issue;
private void dataGridView2_CellClick(object sender, DataGridViewCellEventArgs e)
{
textBox4.Text = dataGridView2.SelectedCells[1].Value.ToString();
textBox3.Text = dataGridView2.SelectedCells[2].Value.ToString();
textBox11.Text = dataGridView2.SelectedCells[3].Value.ToString();
textBox1.Text = dataGridView2.SelectedCells[6].Value.ToString();
//////////////////// stock code //////////////////////////////
label14.Text = dataGridView2.SelectedCells[0].Value.ToString();
/////////////////////// category /////////////////////////////
label12.Text = dataGridView2.SelectedCells[4].Value.ToString();
//////////////////////////// purchasing price //////////////////////
label10.Text = dataGridView2.SelectedCells[7].Value.ToString();
////////////////////////// actual quantity //////////////////////////////
label11.Text = dataGridView2.SelectedCells[0].Value.ToString();
}

Try to set current cell selected explicitly
private void dataGridView2_CellClick(object sender, DataGridViewCellEventArgs e)
{
DataGridView grid = sender as DataGridView;
grid.ClearSelection();
grid.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected = true;
//...rest of your code
}

How to show grid row value in textBox on SelectionChanged event C#?

I have to show the grid selected row value into textboxes.I'm using this code, but it's not working. Any help will be appreciated.
private void CRUD_SelectionChanged(object sender, EventArgs e)
{
txtBoxID.Text = CRUD.SelectedRows[0].Cells[0].Value.ToString();
txtBoxStates.Text = CRUD.SelectedRows[1].Cells[1].Value.ToString();
txtBoxName.Text = CRUD.SelectedRows[2].Cells[2].Value.ToString();
txtBoxAddress.Text = CRUD.SelectedRows[3].Cells[3].Value.ToString();
txtBoxCenter.Text = CRUD.SelectedRows[4].Cells[4].Value.ToString();
txtBoxCity.Text = CRUD.SelectedRows[5].Cells[5].Value.ToString();
}

You're indexing your selected rows. if you have less than 6 selected rows, then you will go out of bounds. You probably want to fetch data from only one row. Check if only one row is selected and then use index 0. Make sure you set CRUD.MultiSelect = false
Alternatively use CRUD.CurrentRow which will only ever get you one row.
Form.Designer.cs:
this.CRUD.SelectionChanged += new System.EventHandler(this.CRUD_SelectionChanged);
Form.cs:
private void CRUD_SelectionChanged(object sender, EventArgs e)
{
txtBoxID.Text = CRUD.CurrentRow.Cells[0].Value.ToString();
txtBoxStates.Text = CRUD.CurrentRow.Cells[1].Value.ToString();
txtBoxName.Text = CRUD.CurrentRow.Cells[2].Value.ToString();
txtBoxAddress.Text = CRUD.CurrentRow.Cells[3].Value.ToString();
txtBoxCenter.Text = CRUD.CurrentRow.Cells[4].Value.ToString();
txtBoxCity.Text = CRUD.CurrentRow.Cells[5].Value.ToString();
}

Trouble Getting DataGridView to Work with ComboBox Dropdown

I need some help getting my code to work. DataGridView is proving much more complex that I had anticipated. I need someone to please show me how to fix my code, so that both the DataGridView control can be updated and my DataGridViewComboBoxColumn dropdown and DataGridViewCheckBoxColumn controls all work. I'm okay with any strategy, provided the solution you offer is somewhat elegant and complete. I've already spent far too much time trying to figure this out on my own. Any thoughts or suggestions would be greatly appreciated.
Here is a simplifcation of what my backend looks like:
MySqlDataAdapter dataAdapter = new MySqlDataAdapter(sqlRequestString, this.dbConnection);
MySqlCommandBuilder commandBuilder = new MySqlCommandBuilder(dataAdapter);
DataTable table = new DataTable();
table.Locale = System.Globalization.CultureInfo.InvariantCulture;
dataAdapter.Fill(table);
bindingSource.DataSource = table;
If I get rid of the BindingSource, how do I connect the DataTable directly to the DataGridView, so that the ComboBox and Checkbox columns are properly populated?
UPDATE
This should be a complete overview of how I am attempting to initialize my DataGridView:
private void InitializeComponent()
{
/* ... */
this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.DataGridViewColumn_Section,
this.DataGridViewColumn_Indent,
this.DataGridViewColumn_Content,
this.DataGridViewColumn_Summary,
this.DataGridViewColumn_Role,
this.DataGridViewColumn_Author,
this.DataGridViewColumn_Updated});
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.DataSourceChanged += new System.EventHandler(this.dataGridView1_DataSourceChanged);
this.dataGridView1.CellEnter += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellEnter);
this.dataGridView1.CellLeave += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellLeave);
this.dataGridView1.ColumnAdded += new System.Windows.Forms.DataGridViewColumnEventHandler(this.dataGridView1_ColumnAdded);
this.dataGridView1.SelectionChanged += new System.EventHandler(this.dataGridView1_SelectionChanged);
this.dataGridView1.Leave += new System.EventHandler(this.dataGridView1_Leave);
//
// DataGridViewColumn_Section
//
this.DataGridViewColumn_Section.HeaderText = "Section";
this.DataGridViewColumn_Section.Name = "DataGridViewColumn_Section";
//
// DataGridViewColumn_Indent
//
this.DataGridViewColumn_Indent.HeaderText = "Indent";
this.DataGridViewColumn_Indent.Name = "DataGridViewColumn_Indent";
//
// DataGridViewColumn_Content
//
this.DataGridViewColumn_Content.HeaderText = "Content";
this.DataGridViewColumn_Content.MinimumWidth = 100;
this.DataGridViewColumn_Content.Name = "DataGridViewColumn_Content";
//
// DataGridViewColumn_Summary
//
this.DataGridViewColumn_Summary.HeaderText = "Summary";
this.DataGridViewColumn_Summary.Name = "DataGridViewColumn_Summary";
//
// DataGridViewColumn_Role
//
this.DataGridViewColumn_Role.HeaderText = "Minimum Signoff";
this.DataGridViewColumn_Role.Name = "DataGridViewColumn_Role";
//
// DataGridViewColumn_Author
//
this.DataGridViewColumn_Author.HeaderText = "Author";
this.DataGridViewColumn_Author.Name = "DataGridViewColumn_Author";
this.DataGridViewColumn_Author.ReadOnly = true;
//
// DataGridViewColumn_Updated
//
this.DataGridViewColumn_Updated.HeaderText = "Updated";
this.DataGridViewColumn_Updated.Name = "DataGridViewColumn_Updated";
this.DataGridViewColumn_Updated.ReadOnly = true;
/* ... */
}
public MyWinform()
{
InitializeComponent();
// Initialize DataGridView DataTable
this.dgvDataTable = new DataTable();
// Initialize DataGridView column indexes
this.idxSection = dataGridView1.Columns["DataGridViewColumn_Section"].Index;
this.idxIndent = dataGridView1.Columns["DataGridViewColumn_Indent"].Index;
this.idxContent = dataGridView1.Columns["DataGridViewColumn_Content"].Index;
this.idxSummary = dataGridView1.Columns["DataGridViewColumn_Summary"].Index;
this.idxRole = dataGridView1.Columns["DataGridViewColumn_Role"].Index;
this.idxAuthor = dataGridView1.Columns["DataGridViewColumn_Author"].Index;
this.idxLastUpdate = dataGridView1.Columns["DataGridViewColumn_Updated"].Index;
}
private void MyWinform_Load(object sender, EventArgs e)
{
DataGridView dgv = this.dataGridView1;
DataGridViewComboBoxColumn comboCol;
// Load System Menu
SystemMenu.Load(this.Handle);
// Insert selection prompt
ProcTemplateRecord selectProcPrompt = new ProcTemplateRecord();
selectProcPrompt.PrimaryKey = 0;
selectProcPrompt.ProcName = "Select from the list...";
this.procList.Insert(0, selectProcPrompt);
// Add new procedure prompt
ProcTemplateRecord newProcPrompt = new ProcTemplateRecord();
newProcPrompt.PrimaryKey = -1;
newProcPrompt.ProcName = "Start a new Safe Job Procedure";
this.procList.Add(newProcPrompt);
// Finish initializing the ComboBox dropdown list
this.comboBox1.DataSource = this.procList;
this.comboBox1.DisplayMember = "ProcName";
this.comboBox1.ValueMember = "PrimaryKey";
// Finish initializing DataGridView and bind to BindingSource
this.dataGridView1.AutoGenerateColumns = false;
/*
// Finish initializing the DataGridView ComboBox columns...
comboCol = (DataGridViewComboBoxColumn)dgv.Columns[this.idxSection];
comboCol.DataSource = Enum.GetValues(typeof(SectionType));
comboCol.ValueType = typeof(SectionType);
comboCol.DropDownWidth = ComboBoxMaxLabelWidth(comboCol);
comboCol = (DataGridViewComboBoxColumn)dgv.Columns[this.idxRole];
comboCol.DataSource = Enum.GetValues(typeof(RoleType));
comboCol.ValueType = typeof(RoleType);
comboCol.DropDownWidth = ComboBoxMaxLabelWidth(comboCol);
this.dataGridView1.DataSource = this.dgvDataTable;
*/
this.RefreshDataGridViewColumnWidths();
// Setup post-initialization DataGridViewEvent handlers
this.dataGridView1.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellValueChanged);
this.dataGridView1.CurrentCellDirtyStateChanged += new System.EventHandler(this.dataGridView1_CurrentCellDirtyStateChanged);
}
private void dataGridView1_DataSourceChanged(object sender, EventArgs e)
{
this.RefreshDataGridViewColumnWidths();
}
private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
this.RefreshButtons();
if (e.ColumnIndex == this.idxSection)
{
this.label_dgvToolTip.Visible = false;
}
else if (e.ColumnIndex == this.idxIndent)
{
this.label_dgvToolTip.Visible = false;
}
else if (e.ColumnIndex == this.idxContent)
{
this.label_dgvToolTip.Visible = false;
}
else if (e.ColumnIndex == this.idxSummary)
{
this.label_dgvToolTip.Visible = false;
}
else if (e.ColumnIndex == this.idxRole)
{
this.label_dgvToolTip.Visible = false;
}
else if (e.ColumnIndex == this.idxAuthor)
{
this.label_dgvToolTip.Visible = false;
this.label_dgvToolTip.Text = "Author column values are read only.";
this.label_dgvToolTip.Visible = true;
}
else if (e.ColumnIndex == this.idxLastUpdate)
{
this.label_dgvToolTip.Visible = false;
this.label_dgvToolTip.Text = "Updated column values are read only.";
this.label_dgvToolTip.Visible = true;
}
else
{
this.label_dgvToolTip.Visible = false;
}
this.idxActiveColumn = e.ColumnIndex;
this.idxActiveRow = e.RowIndex;
}
private void dataGridView1_CellLeave(object sender, DataGridViewCellEventArgs e)
{
this.label_dgvToolTip.Visible = false;
this.RefreshButtons();
}
private void dataGridView1_ColumnAdded(object sender, DataGridViewColumnEventArgs e)
{
DataGridView dgv = this.dataGridView1;
if ((e.Column.DataPropertyName == "PageSection") &&
(e.Column.CellType != typeof(DataGridViewComboBoxCell)))
{
var cbo = GetComboBoxColumn(e.Column);
cbo.DataSource = Enum.GetValues(typeof(SectionType));
cbo.ValueType = typeof(SectionType);
dgv.Columns.Remove(e.Column);
dgv.Columns.Add(cbo);
}
else if ((e.Column.DataPropertyName == "UserRole") &&
(e.Column.CellType != typeof(DataGridViewComboBoxCell)))
{
var cbo = GetComboBoxColumn(e.Column);
cbo.DataSource = Enum.GetValues(typeof(RoleType));
cbo.ValueType = typeof(RoleType);
dgv.Columns.Remove(e.Column);
dgv.Columns.Add(cbo);
}
}
private void dataGridView1_SelectionChanged(object sender, EventArgs e)
{
this.RefreshButtons();
}
private void dataGridView1_Leave(object sender, EventArgs e)
{
DataGridView dgv = this.dataGridView1;
if (dgv.SelectedCells.Count == 0)
{
this.idxActiveColumn = -1;
this.idxActiveRow = -1;
}
}
private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
DataGridViewComboBoxCell sectionCell = (DataGridViewComboBoxCell)dgv.Rows[e.RowIndex].Cells[this.idxSection];
DataGridViewTextBoxCell indentCell = (DataGridViewTextBoxCell)dgv.Rows[e.RowIndex].Cells[this.idxIndent];
DataGridViewComboBoxCell roleCell = (DataGridViewComboBoxCell)dgv.Rows[e.RowIndex].Cells[this.idxRole];
Int32 colIndex = e.ColumnIndex;
try
{
if (colIndex == this.idxIndent)
{
int number;
string cellValue = indentCell.Value.ToString();
bool isNumeric = int.TryParse(cellValue, out number);
if (!isNumeric)
{
cellValue = cellValue.Substring(0, cellValue.Length - 1);
indentCell.Value = cellValue;
}
}
// Column resizing code goes last
this.RefreshDataGridViewColumnWidths();
this.dgvIsDirty = true;
}
catch (Exception ex)
{
throw new Exception("Failed to refresh DataGridView on cell change.", ex);
}
}
private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
DataGridView dgv = (DataGridView)sender;
try
{
if (dgv.IsCurrentCellDirty)
{
// This fires the cell value changed handler below
dgv.CommitEdit(DataGridViewDataErrorContexts.Commit);
this.RefreshDataGridViewColumnWidths();
}
}
catch (Exception ex)
{
throw new Exception("Failed to commit edit of DataGridView cell.", ex);
}
}
This is the code I am using to update my DataGridView contorl:
// Load the data from the database into the DataGridView
this.dbif.GetProcedure(this.procList.ElementAt(selectedIndex).PrimaryKey, ref this.dgvDataTable);
DataRow[] rows = this.dgvDataTable.Select();
//Object dgvDataSource = dgv.DataSource;
//dgv.DataSource = null;
foreach (DataRow dataRow in rows)
{
DataGridViewRow dgvRow = new DataGridViewRow();
dgvRow.CreateCells(dgv);
dgvRow.Cells[idxSection].Value = dataRow.Field<string>(0);
dgvRow.Cells[idxIndent].Value = dataRow.Field<byte>(1);
dgvRow.Cells[idxContent].Value = dataRow.Field<string>(3);
dgvRow.Cells[idxSummary].Value = dataRow.Field<UInt32>(4) != 0;
dgvRow.Cells[idxRole].Value = dataRow.Field<string>(5);
dgvRow.Cells[idxAuthor].Value = dataRow.Field<string>(6) + dataRow.Field<string>(7);
dgvRow.Cells[idxLastUpdate].Value = dataRow.Field<DateTime>(8).ToString();
dgv.Rows.Add(dgvRow);
}
//dgv.DataSource = dgvDataSource;
This is how my enumerations are defined:
public enum SectionType
{
ESJP_SECTION_HEADER = 1, // start with 1 for database compatibility
ESJP_SECTION_FOOTER,
ESJP_SECTION_BODY
}
public enum RoleType
{
ESJP_ROLE_NONE = 1, // start with 1 for database compatibility
ESJP_ROLE_TEST_ENG,
ESJP_ROLE_FEATURE_LEAD,
ESJP_ROLE_TEAM_LEAD
}

There are a number of issues/improvements. There are too many unknowns about the data to fix everything, but some techniques shown here may help.
1. Manually populating the DGV
You ought not have to do that. Just setting the DataTable as the DataSource will work most of the columns.
2. Expressions
You have 2 expressions where you populate the dgv:
dgvRow.Cells[idxSummary].Value = dataRow.Field<UInt32>(4) != 0;
dgvRow.Cells[idxAuthor].Value = dataRow.Field<string>(6) + dataRow.Field<string>(7);
This leads me to believe the dgv is ReadOnly. Otherwise you will have trouble with those. The Summary for instance: if the user Unchecks the column, you can set that value to 0, but what if they check it? How will you know what value to set??
Indent as Byte seems odd too - almost like it is a boolean.
3. Combos
In a previous question, the dgv was populated from a List<Class>. With that as the `DataSource, an Enum works well because the 2 properties were of that Type. With an enum, the following works:
cbo.ValueType = typeof(RoleType);
It's less likely to work with a DataTable as in version 1, 2 or 3 of this question because there is no db/Datatable type of SectionType or RoleType. In other cases where there is a translation - show the user "ESJP_SECTION_HEADER" but store 2 in the DataTable and ultimately the DB - a small NameValue pairs list will work. A different data model means a different approach to the DGV cbo.
It now looks like those are text columns (I've asked 3 times). If so, you really just need to constrain the selection to the enum names. In the IDE, paste in the text for the Items property:
Alternatively, you can do so in code:
private string[] secList = {"ESJP_SECTION_HEADER","ESJP_SECTION_FOOTER",
"ESJP_SECTION_BODY"};
...
((DataGridViewComboBoxColumn)dgv1.Columns["PageSection"]).Items.AddRange(secList);
AutoGenerateColumns
When the DataSource for a DGV is set, by default it will automatically create a DGVcolumn for each DTColumn, and this works well for the most part. Sometimes you'll want some small tweak like hide an Id column, or change a TextColumn to a CBOColumn. Code in the ColumnAddedEvent to make these changes rather than manually laying out columns can work well.
But since there are quite a few such such changes and since you have already layed out columns in the IDE, you want to be sure to set AutoGenerateColumns to false somewhere in code. Otherwise it will add still more columns.
Setup
Things you may or may not have done in the DGV designer:
Add the columns in whatever order you wish, but be sure to assign the DataPropertyName to the name used in the SQL query. Leave it blank for Author.
Expression columns like Author means either changing the query or doing some formatting in the DGV. For this, add First and Last name columns to the DGV as well as the Author column. Make the first two invisible. The code below shows the formatting. (Make sure that the compound column (Author) appears after the parts!).
Normally, I would try to do that in SQL: SELECT (First + Last) AS Author, but if you do not want to mess with that query, you can concat in DGV events.
Be sure to add the names for the Page and Role columns to the Items collection.
Then, the rest is fairly simple:
private DataTable dtF;
...
string SQL = "SELECT PageSection, Indent, Content, SummaryId, "
+ "UserRole, AuthorFirstN, AuthorLastN, LastUpdated FROM FellPage";
using (var dbCon = new MySqlConnection(MySQLConnStr))
using (var cmd = new MySqlCommand(SQL, dbCon))
{
dbCon.Open();
dtF = new DataTable();
dtF.Load(cmd.ExecuteReader());
}
// IMPORTANT!!!
dgv1.AutoGenerateColumns = false;
dgv1.DataSource = dtF;
The formatting event:
private void dgv1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if (dgv1.Rows[e.RowIndex].IsNewRow)
return;
if (e.ColumnIndex == 7) // ie "Author"
{
e.Value = dgv1.Rows[e.RowIndex].Cells[6].Value.ToString() + ", " +
dgv1.Rows[e.RowIndex].Cells[5].Value.ToString();
e.FormattingApplied = true;
}
}
Result:
It is very important to turn off AutoGenerateColumns. By default, the dgv will add columns for everything in the source. Since you added them, set that to false in the code (there is no IDE property for it).
By virtue of Summary and Indent being defined as check columns, it translates non zero as true. I have no idea how you will edit any SummaryId value. That should probably be a text column so they can enter a value, if that is allowed (that col could be read only too?).
My query and such arent as complex as yours, and surely there are some details I/we are unaware of which have been omitted. But there is certainly a much less gyrations and code to get it working...whatever this is.
Being bound to a DataTable, when the user edits anything, the changes flow thru to the underlying DataTable (use the various Validating events to check their work). The DataTable in turn tracks the state of each row - new, changed, deleted - so later you can:
var changes = dtF.GetChanges();
This will return all the rows which have been changed since the last AcceptChanges().

How do i add a previous and next button to datagridview

I am using Visual studio 2012 and have made a windows form application, for one of the forms I am using a datagridview which shows the information of a table from the SQL database.
I have made the form load information from the datagridview rows directly into a textbox automatically.
SqlDataAdapter SDA = new SqlDataAdapter("SELECT * FROM Stock", con);
DataTable DATA = new DataTable();
SDA.Fill(DATA);
dataGridView1.DataSource = DATA
txtStock3.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
Descriptioncombo2.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
txtprice2.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
The problem is that I need to add a previous button and a next button so that users can navigate through the datagridview rows and see the information in a textbox from each column of a datagridview row. I have looked at similar questions and have browsed through the internet to look for a solution to my problem but i can't seem to find a way which works with my code. Also could you tell me how to add a line of code which tells the user that there is no more rows to select if they click next through all rows of the database.

One way to provide navigation is by using a BindingNavigator where you can remove unnecessary buttons and for TextBox you can data binding.
Code responsible for loading data. Replace the console.writeline in the catch as you see fit e.g. write to a log file etc.
public class DataOperations
{
public DataTable LoadCustomers()
{
DataTable dtCustomers = new DataTable();
using (SqlConnection cn = new SqlConnection(Properties.Settings.Default.ConnectionString))
{
string commandText = #"SELECT [Identfier], [CompanyName],[ContactName],[ContactTitle] FROM [NORTHWND1.MDF].[dbo].[Customers]";
using (SqlCommand cmd = new SqlCommand(commandText, cn))
{
try
{
cn.Open();
dtCustomers.Load(cmd.ExecuteReader());
dtCustomers.Columns["Identfier"].ColumnMapping = MappingType.Hidden;
dtCustomers.Columns["ContactTitle"].ColumnMapping = MappingType.Hidden;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
return dtCustomers;
}
}
On a form, one BindingNavigator, one dataGridView, one TextBox
DataOperations dataOps = new DataOperations();
BindingSource bsCustomers = new BindingSource();
bsCustomers.DataSource = dataOps.LoadCustomers();
dataGridView1.DataSource = bsCustomers;
bindingNavigator1.BindingSource = bsCustomers;
txtContactTitle.DataBindings.Add("Text", bsCustomers, "ContactTitle");
An alternate to the BindingNavigator is to make the BindingSource form level, private variable. Then in buttons call BindingSource.Move method e.g. bsCustomers.MoveFirst(). Of course there is MoveNext, MoveLast and MovePrevious too.

//first
int i = 0;
this.dataGridView1.CurrentCell = dataGridView1.Rows[0].Cells[dataGridView1.CurrentCell.ColumnIndex];
//prev
int prev = dataGridView1.CurrentRow.Index - 1;
if (prev >= 0)
{
this.dataGridView1.CurrentCell = dataGridView1.Rows[prev].Cells[dataGridView1.CurrentCell.ColumnIndex];
//MessageBox.Show(dataGridView1[0, dataGridView1.CurrentRow.Index].Value.ToString());
}
//next
int next = dataGridView1.CurrentRow.Index + 1;
if (next < dataGridView1.Rows.Count)
{
this.dataGridView1.CurrentCell = dataGridView1.Rows[next].Cells[dataGridView1.CurrentCell.ColumnIndex];
//MessageBox.Show(dataGridView1[0, dataGridView1.CurrentRow.Index].Value.ToString());
}
//last
int i = dataGridView1.Rows.Count - 1;
if (i < dataGridView1.Rows.Count)
{
this.dataGridView1.CurrentCell = dataGridView1.Rows[i].Cells[dataGridView1.CurrentCell.ColumnIndex];
//MessageBox.Show(dataGridView1[0, dataGridView1.CurrentRow.Index].Value.ToString());
}

As an alternate to Karen's solution, if you prefer/must go with buttons to navigate then you'll want to handle the CurrentCellChanged event as well as the following button Click events:
private void DataGridView1_CurrentCellChanged(object sender, EventArgs e)
{
if (this.dataGridView1.CurrentRow != null)
{
txtStock3.Text = dataGridView1.CurrentRow.Cells[0].Value.ToString();
Descriptioncombo2.Text = dataGridView1.CurrentRow.Cells[1].Value.ToString();
txtprice2.Text = dataGridView1.CurrentRow.Cells[2].Value.ToString();
this.prevButton.Enabled = this.dataGridView1.CurrentRow.Index > 0;
this.nextButton.Enabled = this.dataGridView1.CurrentRow.Index < this.dataGridView1.Rows.Count - 1;
}
}
private void PrevButton_Click(object sender, EventArgs e)
{
int prev = this.dataGridView1.CurrentRow.Index - 1;
this.dataGridView1.CurrentCell = this.dataGridView1.Rows[prev].Cells[this.dataGridView1.CurrentCell.ColumnIndex];
}
private void NextButton_Click(object sender, EventArgs e)
{
int next = this.dataGridView1.CurrentRow.Index + 1;
this.dataGridView1.CurrentCell = this.dataGridView1.Rows[next].Cells[this.dataGridView1.CurrentCell.ColumnIndex];
}
The CurrentCellChanged event will handle logic for if you can click Previous or Next. Their respective click events simply move the current cell backwards or forwards one row.

You configure the comulmns in the grid to be your matching types. Then after the query you bind the data to this gridView. You add two buttons where the "next" button will fetch the currentselectedrow of the grid, and set it's follower to be the selected one. previous will do the opposite. This is a small pain in the ass. I hate grids in WinForms. The last 4 years, since I did not see them, have been the happiest years of my lif

textbox auto complete (Multi Line)

I am making a auto suggestion / complete textbox in C#, i followed below link, but text box isnt showing the suggestions
How to create autosuggest textbox in windows forms?
//-------- Get all distinct description -----------------------------
OleDbCommand command = new OleDbCommand(Queries.qry16, Connection);
OleDbDataReader reader = command.ExecuteReader();
//--------- Storing ------------------------------------
while (reader.Read())
{
namesCollection.Add(reader.GetValue(0).ToString());
}
//----------- Close after use ---------------------------------------
reader.Close();
//----------- Set the auto suggestion in description box ------------
descriptionBox.AutoCompleteMode = AutoCompleteMode.Suggest;
descriptionBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
descriptionBox.AutoCompleteCustomSource = namesCollection;
Here is my code , it is in load function of winform. And the nameCollection initializtion is in constructor... kindly please help to make it working.
I am editing my post rather then creating new... I have tried the my own code in single line textbox and it worked. Now i want the same in multi line... For research i googled more then 2 days trying different codes (one with intelli sense) but it didnt worked as auto suggestion available in textbox. Can any one give me suggestion to code the whole procedure to multi line.. Thank you.

AutoCompleteSource does not work on multiline TextBox controls.
Wich means you need to make it from scratch:
I would make a ListBox to display the content of your autocomplete:
var listBox = new ListBox();
Controls.Add(listBox);
You need eventhandling on your textbox however this is a bit crude, so i would rewrite it to stop the keyupevent at some point:
private void textBox_KeyUp(object sender, KeyEventArgs e)
{
var x = textBox.Left;
var y = textBox.Top + textBox.Height;
var width = textBox.Width + 20;
const int height = 40;
listBox.SetBounds(x, y, width, height );
listBox.KeyDown += listBox_SelectedIndexChanged;
List<string> localList = list.Where(z => z.StartsWith(textBox.Text)).ToList();
if(localList.Any() && !string.IsNullOrEmpty(textBox.Text))
{
listBox.DataSource = localList;
listBox.Show();
listBox.Focus();
}
}
Now all you need is a handler to set the text in your textBox:
void listBox_SelectedIndexChanged(object sender, KeyEventArgs e)
{
if(e.KeyValue == (decimal) Keys.Enter)
{
textBox2.Text = ((ListBox)sender).SelectedItem.ToString();
listBox.Hide();
}
}
Put in null checks where appropriate

You need to add a New Component class by 'Adding New Item'. and then write the code for that class and then add that component wherever required..

Try this code as it works in my case:
AutoCompleteStringCollection MyCollection = new AutoCompleteStringCollection();
while (reader.Read())
{
namesCollection.Add(reader.GetString(0));
}
reader.Close();
descriptionBox.AutoCompleteMode = AutoCompleteMode.Suggest;
descriptionBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
descriptionBox.AutoCompleteCustomSource = namesCollection;
con.Close();
Please check if the reader is getting the desired records..:)

Bit of confusion on the "auto-suggestion" since that is basically auto-complete without the permission from the user to "complete" the text. Nevertheless here are a couple of links you might find helpful:
http://docs.jquery.com/UI/Autocomplete
Autocomplete functionality on a textarea
AutoComplete extender for multi-line Textbox
Scroll down on link #2, a user suggested a jquery solution and compare with link #1. You may find a solution.
Third link is from asp forums, similar question like yours was also answered by a link. You might want to check that out.

Thismay help you solving problem ;
You can change table name. you can change the query to load listbox.
ListBox lbox;
private void IletisimBilgileriDoldur()
{
try
{
string strQuery= "Select adres From tblIletisimBilgileri Where adres <> '';";
veri = new OleDbCommand(strQuery,strConn);
veri.CommandType = CommandType.Text;
if (strConn.State == ConnectionState.Closed) strConn.Open();
oku = veri.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(oku);
oku.Close();
txtAdres.AutoCompleteCustomSource.Clear();
if (dt.Rows.Count >= 0)
{
lbox = new ListBox();
for (int count = 0; count < dt.Rows.Count; count++)
{
lbox.Items.Add(dt.Rows[count]["adres"].ToString());
}
}
txtAdres.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
txtAdres.AutoCompleteSource = AutoCompleteSource.CustomSource;
if (strConn.State == ConnectionState.Open) strConn.Close();
}
catch (Exception)
{
if (strConn.State == ConnectionState.Open) strConn.Close();
}
}
private void txtAdres_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
var x = txtAdres.Left;
var y = txtAdres.Top + txtAdres.Height;
var width = txtAdres.Width;
const int height = 120;
lbox.SetBounds(x, y, width, height);
lbox.KeyDown += lbox_SelectedIndexChanged;
lbox.DoubleClick += lbox_DoubleClick;
gbxAdres.Controls.Add(lbox);
lbox.BringToFront();
lbox.Show();
ActiveControl = txtAdres;
}
void lbox_DoubleClick(object sender, EventArgs e)
{
txtAdres.Text = ((ListBox)sender).SelectedItem.ToString();
lbox.Hide();
}