merging two datagridview columns into one new column

Question

i want to merge two datagridview columns into one new column.

i first change Visible property of two col to false, then i try to add new col which that value must be

Answer 1

You can made your own implementation of the DataGridViewTextBoxCell and override GetFormattedValue method for it. There you can return the formatted value for your column below is an example:

// use custom DataGridViewTextBoxCell as columns's template
col.CellTemplate = new MyDataGridViewTextBoxCell();

...

// custom DataGridViewTextBoxCell implementation 
public class MyDataGridViewTextBoxCell : DataGridViewTextBoxCell
{
    protected override Object GetFormattedValue(Object value,
        int rowIndex,
        ref DataGridViewCellStyle cellStyle,
        TypeConverter valueTypeConverter,
        TypeConverter formattedValueTypeConverter,
        DataGridViewDataErrorContexts context)
    {
        return String.Format("{0} per {1}",
            this.DataGridView.Rows[rowIndex].Cells[0].Value,
            this.DataGridView.Rows[rowIndex].Cells[1].Value);
    }
}

hope this helps, regards