DataGridView.Columns.DisplayIndex causes an error 'object reference is not set to an instance of an object' in C# Windows application

Question

I have made a Windows forms application using c# and I am trying to add the edit and delete options in my datagridview. I have written the code for reordering of the columns using DisplayIndex as shown below but it throws a NullReferenceException and gives an error 'Object reference not set to an instance of an object'.I have included these statements in the FormName_Load method and I am using Visual Studio Professional 2013.

        DataGridViewLinkColumn EditLink = new DataGridViewLinkColumn();
        EditLink.UseColumnTextForLinkValue = true;
        EditLink.HeaderText = "Edit";
        //EditLink.DataPropertyName = dataGridView1.ToString();
        EditLink.LinkBehavior = LinkBehavior.SystemDefault;
        EditLink.Text = "edit";
        dataGridView1.Columns.Add(EditLink);
        dataGridView1.Columns["Edit"].DisplayIndex = 9;
        //dataGridView1.Columns["Edit"].Visible = true;

See following link: [What is a NullReferenceException, and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it?rq=1) — bassfader, Jul 14 '16 at 11:55

score 0 · Accepted Answer · edited Jul 14 '16 at 13:19

0

According to MSDN, the DisplayIndex property is zero based, and corresponds to the current position of the column as displayed by the user interface.

Are you certain that

dataGridView1.Columns["Edit"].DisplayIndex = 9;

is in the range of valid indexes?

edited Jul 14 '16 at 13:19

Paul Roub

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answered Jul 14 '16 at 11:59

antydsr

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But I want to put the edit and delete columns after the 9th column in the table......so logically speaking the index should be 9 – shreeya kharbanda Jul 14 '16 at 12:15

DataGridView.Columns.DisplayIndex causes an error 'object reference is not set to an instance of an object' in C# Windows application

1 Answers1