I have added a combobox column to the dataGridView control. However, when I choose something from the combobox and leave the cell, the selected value gets disappeared: the item changes to blank. I haven't written any code in any of the events.

How can I make the selected values stay in the grid?


private void AddComboBoxColumns(int pInt_InsertAfterColumn)

DataGridViewComboBoxColumn comboboxColumn = new DataGridViewComboBoxColumn();

comboboxColumn.HeaderText = "Action";

comboboxColumn.Items.Add("In");

comboboxColumn.Items.Add("Out");

this.dataGridView1.Columns.Insert(pInt_InsertAfterColumn, comboboxColumn);

}

Ok. What is occurring is that you have a mix of bound and unbound columns. The two combo box columns you add in the Form_load event isn't bound to any fields in the database. These unbound columns do not store their values when there is bound columns. Check out section 4.4.4 Mixed mode - Bound and unbound in the DataGridView FAQ (http://www.windowsforms.net/Samples/Go%20To%20Market/DataGridView/DataGridView%20FAQ.doc)

Basically you are responsible for storing values for columns that are unbound when you have bound columns.

There is also a sample in the DataGridView samples collection (http://www.windowsforms.net/Samples/download.aspx?PageId=1&ItemId=216&tabindex=4) that shows having a unbound checkbox column along with databound columns.

Hope this helps,
-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

Can you provide more details on this? I tried your code and I didn't have any problem with the values I select in the combo box cell being persisted. If you can provide specific steps that you do it will help.

thanks,
-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

Ok. What is occurring is that you have a mix of bound and unbound columns. The two combo box columns you add in the Form_load event isn't bound to any fields in the database. These unbound columns do not store their values when there is bound columns. Check out section 4.4.4 Mixed mode - Bound and unbound in the DataGridView FAQ (http://www.windowsforms.net/Samples/Go%20To%20Market/DataGridView/DataGridView%20FAQ.doc)

Basically you are responsible for storing values for columns that are unbound when you have bound columns.

There is also a sample in the DataGridView samples collection (http://www.windowsforms.net/Samples/download.aspx?PageId=1&ItemId=216&tabindex=4) that shows having a unbound checkbox column along with databound columns.

Hope this helps,
-mark
DataGridView Program Manager
Microsoft
This post is provided "as-is"

Hi,

I'm facing the same problem that the selection in DGVComboboxColumn doesn't persist. I checked the FAQ 4.4.4 but can't find any code snippet to solve this problem. Do you have any more hints?

Thanks

I am having the same problems with the DataGridViewComboBoxColumn,

In normal case, If i choose the value manually from the dropdown,the value will be persisted

However, If idouble click on a empty DataGridViewComboBoxColumn, by default it will auto "select" the first item in the dropdown for me, anyway, if i move away from the combobox, the value will be lost.

I tried to trap the value, EditedFormattedValue, and FormattedValue in CellValueChanged Event Handler, but they are all empty.

Similiarly, i also find out that in second case, CurrentCellDirtyStateChanged event is not being fired at all.

Anyone has any solution or workaround? Thanks.