Question

I have a datagridview with columns

                           customername 
                           customerimage
                           price

when i click on the column header the entire datagridview will be sorted for that i have tried the code given in this link http://msdn.microsoft.com/it-it/library/0868ft3z%28v=vs.80%29.aspx

   private void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
    {

         /// i have just put the code given in that link 

              if (newColumn == null)
              {
    MessageBox.Show("Select a single column and try again.",
        "Error: Invalid Selection", MessageBoxButtons.OK,
        MessageBoxIcon.Error);
            }

    }

but it will shows the above message when i click on the column header even if there are some columns has values ……

would any one pls help on this….

many thanks ……

Answer 1

The problem is when you are clicking the header it is not selected.
You must set the selection mode to column header select:

dataGridView1.SelectionMode = DataGridViewSelectionMode.ColumnHeaderSelect;

This must be done before the call of dataGridView1_ColumnHeaderMouseClick(). You can put it in the constructor of the form or onLoad() for example.