DataGridView RowsAdded Index -1 does not have a value ?

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Hi
In window application, I am binding a "DataGridView" DataSource to list of objects. The DGV contains 3 columns. First two column are Simple DataGridViewTextBoxColumn & in 3rd column is type of DataGridViewButtonColumn. It work good but I want to change the name (like Add/Edit) of Button according to some value of Source when adding the rows to gridview. So to this I use RowsAdded event. The Code is

C#

private void gridMappings_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
        {
            if (this.gridMappings.DataSource != null)
            {
                int lastRow = this.gridMappings.Rows.Count - 1;

                for (int i = 0; i < this.gridMappings.Rows.Count; i++)
                {
                    if (this.gridMappings.Rows[i] != null)
                    {
                        this.gridMappings.Rows[i].Cells[2].Value = "Add";
                    }
                    else
                    {
                        this.gridMappings.Rows[i].Cells[2].Value = "Edit";
                    }
                    
                }
            }
        }

It work perfect but after adding the row to gridview, When I click anywhere on grid I am getting error "Index -1 does not have a value." in Program.cs file.

Please help !
Thanks

Posted 25-Sep-14 19:57pm

Vi(ky

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Comments

Sinisa Hajnal 26-Sep-14 2:22am

Set a breakpoint in any other grid handlers you have in your code. I don't think this code causes it.

Try calling gridMappings.CommitEdit. Or Refresh. Or Update. :) Shotgun approach.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 26-Sep-14 3:41am

You should look, what event is called on click of Grid.

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sankarsan parida · Answer 1 · 2014-09-25T22:45:00

Add one more condition which is gridMappings.Rows.Count>0

private void gridMappings_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
        {
            if (this.gridMappings.DataSource != null)
            {
                int lastRow =0;
                if(gridMappings.Rows.Count>0)
                lastRow this.gridMappings.Rows.Count - 1;
 
                for (int i = 0; i < this.gridMappings.Rows.Count; i++)
                {
                    if (this.gridMappings.Rows[i] != null)
                    {
                        this.gridMappings.Rows[i].Cells[2].Value = "Add";
                    }
                    else
                    {
                        this.gridMappings.Rows[i].Cells[2].Value = "Edit";
                    }
                    
                }
            }
        }