Develop Reference

Load data to a data set from data table in C#

I have a dataset called "dts_Material_Report" which is used to generate reports.In that data set I have a tableAdapter called "dt_report_Received_Materials".
Previously I have load the data to that table adapter with following code ,
private void generate_report( string qry )
{
string query, qry1;
query = qry;
int pr_id = Form_Common_PCM.pr_id;
clz_Common_SqlConnection con = new clz_Common_SqlConnection();
SqlDataAdapter sda = new SqlDataAdapter(query, con.ActiveCon());
DataSet dts = new DataSet();
sda.Fill(dts, "dt_report_Received_Materials");
rdc.SetDataSource(dts);
crystalReportViewer1.ReportSource = rdc;
crystalReportViewer1.DisplayToolbar = true;
crystalReportViewer1.Show();
}
But currently I am having all the data which I need to generate the report in one of my data table called "dt_mat_cost".
int Ref_ID_s_category;
Ref_ID_s_category = Convert.ToInt16(cbo_sub_category .SelectedValue );
int pro_id = Form_Common_PCM.pr_id;
clz_Received_Material_Summary rms = new clz_Received_Material_Summary();
DataTable dt_mat_cost = rms.Summary_Material_Cost_Filter_By_Project_By_Sub_Category(Ref_ID_s_category);
Now i want to load those data from "dt_mat_cost" to my tableAdapter "dt_report_Received_Materials" .Is there any way to do this.
Thanks in Advance.

One way to resolve this would be to put the DataTable into a DataSet and then run the crystal code as shown below. You may be able to just set the ReportSource to the datatable but I do not recall off the top of my head if that will work.
DataTable dt_matCost = rms.Summary_Material_Cost_Filter_By_Project_By_Sub_Category(Ref_ID_s_category);
DataSet dts = new DataSet();
dts.Tables.Add(dt_matCost);
//ds.Tables[0].TableName = "Whatever CR thinks it is"; // may need to set for CR
rdc.SetDataSource(dts);
crystalReportViewer1.ReportSource = rdc;
crystalReportViewer1.DisplayToolbar = true;
crystalReportViewer1.Show();

How to I display the data from database from datagridview

How do I display a database table (my database is sdf) to the datagridview?
Here is my code:
private void Show_Button_Click(object sender, EventArgs e)
{
string query = "SELECT * FROM Contact_List";
SqlCeConnection con = new SqlCeConnection(#"Data Source=C:\Co-op\Contact\Contact\ContactDataBase.sdf;Password=********");
using (SqlCeDataAdapter adap = new SqlCeDataAdapter(query, con))
{
DataTable dat = new DataTable();
adap.Fill(dat);
dataGridView1.DataSource = dat;
}
}
The code above doesn't show any data to the datagridview. It only shows a new row with nothing in it. I am using Window Forms application.
This is the Error I get:
'System.Windows.Forms.DataGridView' does not contain a definition for
'DataBind' and no extension method 'DataBind' accepting a first
argument of type 'System.Windows.Forms.DataGridView' could be found
(are you missing a using directive or an assembly reference?)

One suggestion please try Visualize the DataTable in debug mode with breakpoints.
Make sure that data is available in DataTable
Try this sample code:
public void FillDataTable(string sSQL, DataTable dt)// DataTable operations
{
this.cmd = new SqlCommand(sSQL, this.conn);
this.dataAdapter = new SqlDataAdapter(this.cmd);
this.dataAdapter.Fill(dt);
}
Usage:
DataTable preview=new DataTable();
FillDataTable("SELECT * FROM Contact_List", preview);
dataGridView1.DataSource = preview;
Hopefully it must work .

how to select specific field using a filter from access in C#

in C# and windows Form,
I have a database like this:
and this is how I using a class put it's data into a datagridview:
class DBConnection
{
public static void GetList(Form2 frm2)
{
string DBPath = Application.StartupPath;
OleDbConnection Connection = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+DBPath+#"\DataBase\SampleFeeds.accdb");
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from FeedLibrary", Connection);
DataTable Dtable = new DataTable();
DataA.Fill(Dtable);
frm2.SelectedFeeddataGridView.DataSource = Dtable;
}
}
and this is my form load:
private void Form2_Load(object sender, EventArgs e)
{
DBConnection.GetList(this);
}
So far everything is ok.
now I have a question:
for example I have a list box FeedSelectListBox,
I want to when user click on a button GrassLegumeForagebtn my FeedSelectListBox fill with only all of Feed Names that are in the category of Grass / Legume Forage.
how should I do that ?
with help of Damirchi My problem solved
//-----------------
But now I have another question:
I want to when user select a feed from list box all of it's data from data base (like name, number, feed type and ,,,) put in a data grid view.
I used this code on my SelectFeedbtn but it doesn't work :
private void SelectFeedbtn_Click(object sender, EventArgs e)
{
string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings["FeedLibraryConnectionString"].ConnectionString;
OleDbConnection Connection = new OleDbConnection(StrCon);
string FeedSelectedID = FeedSelectListBox.SelectedValue.ToString();
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from FeedLibrary where ID = 'FeedSelectedID'" , Connection);
DataTable DTable = new DataTable();
DataA.Fill(DTable);
SelectedFeeddataGridView.DataSource = DTable;
}
And ValueMember property of FeedSelectListBox is ID but the error is :
An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll.
I even use this query but it still doesn't work:
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from FeedLibrary where ID =" FeedSelectListBox.SelectedValue , Connection);

at first you most set the DisplayMember and ValueMember properties of FeedSelectListBox and use this code on click event.
you can put this code on GrassLegumeForagebtn click event.
string DBPath = Application.StartupPath;
OleDbConnection Connection = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+DBPath+#"\DataBase\SampleFeeds.accdb");
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from FeedLibrary where category='Grass / Legume'", Connection);
DataTable Dtable = new DataTable();
DataA.Fill(Dtable);
frm2.FeedSelectListBox .DataSource = Dtable;

OleDbDataAdapter: cannot update database

I've been working on this since yesterday and I just can't update my database.
There are 3 tables. Here is a piece of code of one of WinForms. It loads data and display but after changing sth manually in the grid I get either errors by calling Update or anything happens at all.
please help because I'm going crazy.
public partial class Form3 : Form
{
//instance fields
private export2Excel export2XLS;
private DataSet _dataSet;
private BindingSource _bsrc;
private OleDbDataAdapter _dAdapter;
private OleDbCommandBuilder _cBuilder;
private DataTable _dTable;
private void button1_Click(object sender, EventArgs e)
{
//create the connection string
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data
Source='C:\\Documents and Settings\\dorota\\Moje dokumenty\\Visual Studio
2010\\Projects\\WindowsFormsApplication1\\WindowsFormsApplication1\\artb.mdb'";
//create the database query
string query = "SELECT * FROM Samochody";
System.Data.DataSet DtSet = new System.Data.DataSet();
_dataSet = DtSet;
//create an OleDbDataAdapter to execute the query
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
dAdapter.FillSchema(_dataSet, SchemaType.Source);
_dAdapter = dAdapter;
//create a command builder
OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(_dAdapter);
_cBuilder = cBuilder;
//create a DataTable to hold the query results
DataTable dTable = new DataTable();
_dTable = dTable;
//fill the DataTable
_dAdapter.Fill(_dTable);
//_dAdapter.TableMappings.Add("Samochody", "Table");
_dAdapter.Fill(_dataSet);
// --------------------- to datagridview !
//BindingSource to sync DataTable and DataGridView
BindingSource _bsrc = new BindingSource();
//set the BindingSource DataSource
//bSource.DataSource = _dTable;
_bsrc.DataSource = _dTable;
//_bsrc = bSource;
//set the DataGridView DataSource
dataGridView1.DataSource = _bsrc;
}
}
and here... :
private void sqlsave_Click(object sender, EventArgs e)
{
//int i=_dAdapter.Update(_dTable);
_dAdapter.Update(_dataSet.Tables["Samochody"]);
//_dAdapter.Update(_dataSet,"Samochody");
}
//---------------------------------------------------------------------------------
ok. I have changed sqlsave method for this
private void sqlsave_Click(object sender, EventArgs e)
{
try
{
//_dAdapter.Update(_dataSet.Tables["Samochody"]);
OleDbCommand oldb= _cBuilder.GetUpdateCommand();
int i=oldb.ExecuteNonQuery();
System.Windows.Forms.MessageBox.Show(i+" rows affected.");
//_dAdapter.Update(_dataSet,"Samochody");
}catch(OleDbException oldbex){
System.Windows.Forms.MessageBox.Show(oldbex.ToString());
}
and now I get finally sth more informative than "Error in"
An unhandled exception of type 'System.InvalidOperationException'
occurred in System.Data.dll Additional information: ExecuteNonQuery
requires an open and available Connection. The connection's current
state is closed.
so let me changed sth and I will let you know if this is it!
//--------------------------------
no. no. too fast, can't last. now while trying to save I've got exception again,
connectin is opened, but (I can't post the image) when I debug this I see that my object of OleDbCommand type as _commandText has
"UPDATE Samochody SET Item=?, Data dyspozycji autem od=?, ..."
and so on.
I think this is the reason. Am I right? What to do?

You didn't provide a connection for your OleDbDataAdapter. Try it something like this:
The example is different from your code but it shows the declaration of New Connection and passing it to the OleDbDataAdapter
string connetionString = null;
OleDbConnection connection ;
OleDbDataAdapter oledbAdapter ;
OleDbCommandBuilder oledbCmdBuilder ;
DataSet ds = new DataSet();
int i = 0;
string sql = null;
connetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Your mdb filename;";
connection = new OleDbConnection(connetionString);
sql = "select * from tblUsers";
try
{
connection.Open(); // your code must have like this
oledbAdapter = new OleDbDataAdapter(sql, connection);
oledbCmdBuilder = new OleDbCommandBuilder(oledbAdapter);
oledbAdapter.Fill(ds);
for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
ds.Tables[0].Rows[i].ItemArray[2] = "neweamil#email.com";
}
oledbAdapter.Update(ds.Tables[0]);
connection.Close();
MessageBox.Show ("Email address updates !");
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}

I've found the answer:
But a better approach would be to use drag-and-drop and learn form the code.
Select Data|View Datasources. Your dataset should be visible in the DataSources Window.
Drag a table to a (new) form. VS2005 will add a load of components and a few lines of code.
The form will now have a instance of the dataset and that is your reference point for Adapter.Fill and .Update methods.
Easy and works great! : D
I've found it here: https://stackoverflow.com/a/548124/1141471

Bind combobox with data from database

I had windows form and I added combobox which bin data from database I added my code but this error apeared (invalid column name Category) altought the name was right .
public Category()
{
InitializeComponent();
CategoryParent();
}
private void CategoryParent()
{
using (SqlConnection Con = GetConnection())
{
SqlDataAdapter da = new SqlDataAdapter("Select Category.Category,Category.Id from Category", Con);
DataTable dt = new DataTable();
da.Fill(dt);
CBParent.DataSource = dt;
CBParent.DisplayMember = "Category";
CBParent.ValueMember = "Id";
}
}

Change your query like this,
Select Category.Category as CatName ,Category.Id from Category
i-e use an alias like "CatName" for your column and set Display member like this,
CBParent.DisplayMember = "CatName";
Hope it shall help.

I checked the connection and I found the connectionstring was wrong