How can I clear rows in DataGridView with C#?

Question

Following Error in this line.

datagridview1.Rows.Clear()

but this line gives error:

Cannot clear this list.

Answer 1

I also had similiar problem when I try to clear DataSource of a DataGridView after I had binded it to a DataTable with:

DataTable DT = ... ; // fill it
datagridview1.DataSource = DT;

when I try to clear it's rows later with the following code:

datagridview1.DataSource = null

I get this error:

ERROR: Object reference not set to an instance of an object

This object reference ERROR problem already solved in here. But I managed to solve my own problem (clearing DataGridView rows) with this code:

DataTable DT = (DataTable)datagridview1.DataSource;
if (DT != null) 
    DT.Clear();

I know that this question was asked a very long time ago, but I hope my solution would solve someone problems.

Answer 2

Is your DataGridView bound to a DataSource, i think thats why its not allowing you to clear it since its bound to an underlying DataTable or List.

you could try setting the DataSource Property to null

datagridview1.DataSource = null; for clearing

Answer 3

private void button_Limpar_Click(object sender, EventArgs e)
{
    DataTable DT = (DataTable)dataGridView_Cidade.DataSource;
    if (DT != null)
        DT.Clear();
}
#endregion

Answer 4

Simply add this line at beginning of your event:

dgv_nameOfGridView.DataSource=false;

Now every time you click it will erase the dgv..