how to add new row in the datagridview in c#.

try this
            DataGridViewColumn newCol = new DataGridViewColumn();
            DataGridViewCell newCell = new DataGridViewTextBoxCell();
            newCol.CellTemplate = newCell;
            newCol.HeaderText = "columnheaderDisplayName";
            newCol.Name = "columnHeaderName";

            datagridview1.Columns.Add(newCol);

To insert a new row at position 0, you can use:

dataGridView1.Rows.Insert(0, 1);

hi
check fallowing code
 dataGridView1.Rows.Add();