Develop Reference

How to get IDs of only checked rows of a datagridview

I have a datagridview that contains list of subjects populated from Subject table from database.Columns include
Select(checkbox),
SubjectId,
SubjectName,
SubjectGroup.
Now I want if a user Selects on any of the desired rows, the corresponding SubjectId's should be added to a List. I have made and inserted into the desired table in the database.
The problem is that the new column of checkboxes I have added to this datagridview is not being detected.
My code is:
foreach (DataGridViewRow row in gvSubjectsOpted.Rows)
{
if (Convert.ToBoolean(gvSubjectsOpted.SelectedRows[0].Cells["SelectId"].Value=true))
{
olist.Add(gvSubjectsOpted.SelectedRows[0].Cells["SubjectId"].Value.ToString());
}
}

Late to the party. I had the same issue with trying to get the checkbox column by name, use the index instead. Here is a linq example assuming the checkbox is column 0 and the stored values for TrueValue and FalseVale are true and false respectively.
var checkedRows = from DataGridViewRow r in gvSubjectsOpted.Rows
where Convert.ToBoolean(r.Cells[0].Value) == true
select r;
foreach (var row in checkedRows)
{
olist.Add(row.Cells["SubjectId"].Value.ToString());
}

I realise this is an old post but I came across it and didn't think it was really answered in an efficient way so I thought I would add my method.
I have a similar block in my windows app. I read the values from the grid when the user clicks a button, and I want to know which rows they checked. As the checkboxes are in Cell 0 and the data I want is in Cell 1, I use the following code. Note the cast: it is important as it allows us the use the Where clause and therefore just a single line of code to get the collection of data. I could use the name of the cells instead of magic index numbers but then it would not fit your app so I put numbers instead (you should use names)
var checkedRows = dataGridView
.Rows
.Cast<DataGridViewRow>()
.Where(x => x.Cells[0].Value.ToString() == "1")
.Select(x => x.Cells[1]);
Note that this will give you an IEnumerable of type DataGridViewCell. If you want you can either add something like .Value.ToString() to the select or do this when you use your collection.

You question is similar to another SO question.
Check the answer of this Datagridview checkboxcolumn value and functionality.

Try this
foreach(GridViewRow r in gvSubjectsOpted.Rows)
{
GridViewCheckBoxColumn c = r.cells[0].Controls[0] as GridViewCheckBoxColumn;
if(c.Checked)
{
//Do something.
}
}

private void button1_Click(object sender, EventArgs e)
{
string subjId;
List<string> lines = new List<string>();
for (int i = 0; i < gvSubjectsList.Rows.Count; i++)
{
bool Ischecked =Convert.ToBoolean(gvSubjectsList.Rows[i].Cells["Select"].Value);
if (Ischecked == true)
{
subjId = gvSubjectsList.Rows[i].Cells["SubjectId"].Value.ToString();
lines.Add(subjId);
}
}
comboBox1.DataSource = lines;
}
//the most important thing is to set 'true' and 'false' values against newly added checkboxcolumn instead of '0' and '1'...that is,
CBColumn.FalseValue = "false";
CBColumn.TrueValue = "true";

DevExpress GridView | DataGridView

I want to do the following but using GridView of DevExpress , how Can I do that please ?
List<RCDATA_INDEX> somethings = new List<RCDATA_INDEX>();
foreach (DataGridViewRow row in (IEnumerable)this.dataGridView1.Rows)
{
AZ.RCDATA_INDEX items = new AZ.RCDATA_INDEX
{
datasize = Convert.ToUInt32(row.Cells[5].Value.ToString())
};
item.filenum = Convert.ToUInt32(row.Cells[2].Value.ToString()[7].ToString());
item.hash = row.Cells[1].Value.ToString();
item.realname = row.Cells[3].Value.ToString();
item.offset = Convert.ToUInt32(row.Cells[4].Value.ToString());
item.new_value = row.Cells[6].Value.ToString();
somethings.Add(items);
}

You can traverse through all the data rows within a GridView one-by-one, using the following approach:
// Obtain the number of data rows.
int dataRowCount = gridView.DataRowCount;
// Traverse data rows
for (int i = 0; i < dataRowCount; i++) {
object cellValue = gridView.GetRowCellValue(i, "... specify field name here ...");
// do something with cell Value
}
Please refer the Traversing Rows and Obtaining and Setting Cell Values help-articles to learn more;

I would prefer using BindingSource and bind it into Gridview. After that if you want to making manipulation of your data. You just need to call like this :
List<RCDATA_INDEX> somethings = new List<RCDATA_INDEX>();
var Result = RCDataBS.Cast<RCDATA_INDEX>();
somethings.AddRange(Result);
It would be much easier using this code and you don't need to spend your resource to convert all the data into your model.

Unable to get DatagridView to select proper row

I cannot understand what is happening here:
void FindRecord(string pRecordID){
dgv_cusData.ClearSelection();
for(int i=0;i < dgv_cusData.Rows.Count;i++){
if (dgv_cusData.Rows[i].Cells["recordid"].Value.ToString()==pRecordID){
dgv_cusData.CurrentCell = dgv_cusData.Rows[i].Cells[1];
dgv_cusData.Rows[i].Selected = true;
}
}
}
pRecordID is a unique column in the DGV. I only have three records in the grid and I know that the selected record is in position 2; however then the SelectionChanged event fires:
void Dgv_cusDataSelectionChanged(object sender, EventArgs e)
{
MessageBox.Show(dgv_cusData.CurrentCell.RowIndex.ToString()); // <---- Returns 0;
lbl_DetailsLabel.Text = "Details For "+dgv_cusData.CurrentRow.Cells[1].Value;
}
The CurrentCell.RowIndex always returns 0. Am I missing something while trying to select a current row in the DGV? Any help would be appreciated. Cheers!

I wonder if selecting the row is was causes you to lose the CurrentCell.
Does the row highlight in the datagridview?
Do you allow multiple row selections on the grid. If not I think you would get better results with the following:
MessageBox.Show(dgv_cusData.SelectedRows[0].Index.ToString());
And:
lbl_DetailsLabel.Text = "Details For "+ dgv_cusData.Rows(dgv_cusData.SelectedRows(0).Index).Cells[1].Value;

move datagridview Row to another datagridView

I've gone through the other answers for this kind of question, nothing has really worked well so far.
I have a foreach loop that should add the the row from the source datagridview to the destination datagridview then remove that row from the source.
The invalid operation exception is: Row provided already belongs to a DataGridView control.
I couldn't get ...Rows.Copy() to work either. Any ideas?
foreach (DataGridViewRow selRow in fromDataGridView.SelectedRows)
{
toDataGridView.Rows.Add(selRow);
fromDataGridView.Rows.Remove(selRow);
}

You need to remove the row from fromDataGridView before you add it to toDataGridView.
But you're modifying the collection inside the foreach loop - that won't work.
The workaround is to copy the collection for use in the foreach.
Try this:
foreach (DataGridViewRow selRow in fromDataGridView.SelectedRows.OfType<DataGridViewRow>().ToArray())
{
fromDataGridView.Rows.Remove(selRow);
toDataGridView.Rows.Add(selRow);
}

Here is an example of what you could do or try..
its happening when one row is removed the rows count decrements too so if you put your code in for loop and run it in reverse it would work fine have a look:
for (int selRow = dataGridView1.Rows.Count -1; selRow >= 0 ; selRow--)
{
toDataGridView.Rows.Add(selRow);
fromDataGridView.Rows.Remove(selRow);
}

Adding a new row directly to DataGridView is not possible when there is BindingSource.
You should add row to the BindingSource of second view and let it to add the row to its grid.
I've tested the below code in a working solution.
var selectedRows = dataGridView1.SelectedRows;
int count = dataGridView1.SelectedRows.Count;
for (int i = 0; i < count; i++)
{
bindingSource2.Add(bindingSource1[selectedRows[i].Index]);
dataGridView1.Rows.Remove(selectedRows[i]);
}

Finding an item in asp.ListView with Value when paging is enabled

I'm trying to find the selected Item in an aspx ListView that is on a separate page, then switch the page and select the item. I have the value property of the ListViewItem I am looking for, but cannot seem to get it to work. Here is what I tried:
for (int i = 0; i < lvProject.Items.Count; i++)
{
if (((Label)lvProject.Items[i].FindControl("Project_IDLabel")).Text == project.ToString())
{
lvProject.SelectItem(i);
break;
}
}
So lvProject is my list view. The project Variable is an Int64 which represents the UID of my Project. This is also the Value of my ListViewItems. The problem with the code above is that when paging is enabled, and the item is on a different page this will not work because the listView.Items.Count is set to the # of Items on the current page only.
My goal is to find the item, set the listview to display the correct page, and finally select the item. You would figure that I could just set the SelectedValue property, but this is not that simple as it is read only. Any ideas would help greatly, thanks in advance.
--Roman

In order to get the total record count from the object data source, you should use the Selected event as follows:
protected void ObjectDataSource1_Selected(object sender, ObjectDataSourceStatusEventArgs e)
{
// Get total count from the ObjectDataSource
DataTable dt = e.ReturnValue as DataTable;
if (dt != null) recordCount = dt.Rows.Count; // recordCount being declared outside the method
}
You would then be able to search for the item as follows:
for (int i = 0; i < recordCount; i++)
{
Label lblItem = (Label)lvProject.Items[i].FindControl("IdLabel");
if (lblItem.Text.Equals(itemToSearch))
{
lvProject.SelectedIndex = i;
break;
}
}
Hope it helps!

How do you bind ListView Items?
If you are using database level paging (stored procedure, query) - you should do search in the same way - using database query/stored procedure by passing a search criteria.
If you are bind ListView Items to a collection of items which are provided by a business/data layer - you have to create search method on layer which provides items so this method will be able to loop through the items.

You should set the SelectedIndex property to i
for (int i = 0; i < lvProject.Items.Count; i++)
{
if (((Label)lvProject.Items[i].FindControl("Project_IDLabel")).Text == project.ToString())
{
lvProject.SelectedIndex = i;
break;
}
}