Having first loaded your DataGridView you then need to pass the DataTable that was the initial source through to a method that looks similar to this:
private void addExtraRows(DataTable dT)
{
DataTable newTable = dT.Clone();
DataRow nR;
int lastRow = dT.Rows.Count - 1;
for (int i = 0; i < lastRow; i++)
{
if (dataGridView3.Rows[i].Cells[1].Value.ToString() == "1.1")
{
for (int j = i + 1; j < dT.Rows.Count; j++)
{
if (dT.Rows[j][2] == dT.Rows[i][2] && dT.Rows[j][3] == dT.Rows[i][3])
{
nR = newTable.NewRow();
nR[0] = dT.Rows[i][0];
nR[1] = "1";
nR[2] = dT.Rows[i][2];
nR[3] = dT.Rows[i][3];
newTable.Rows.Add(nR);
break;
}
}
}
nR = newTable.NewRow();
nR[0] = dT.Rows[i][0];
nR[1] = dT.Rows[i][1];
nR[2] = dT.Rows[i][2];
nR[3] = dT.Rows[i][3];
nR[4] = dT.Rows[i][4];
newTable.Rows.Add(nR);
}
nR = newTable.NewRow();
nR[0] = dT.Rows[lastRow][0];
nR[1] = dT.Rows[lastRow][1];
nR[2] = dT.Rows[lastRow][2];
nR[3] = dT.Rows[lastRow][3];
nR[4] = dT.Rows[lastRow][4];
newTable.Rows.Add(nR);
dataGridView3.DataSource = null;
dataGridView3.Rows.Clear();
dataGridView3.DataSource = newTable;
return;
}
Please note that you may need to change the name of the dataGridView!
Edit:
Assuming that the DataSource of your DataGridView is a DataTable then you can change the start of the method to:
private void addExtraRows()
{
DataTable dT = (DataTable)dataGridView3.DataSource;
DataTable newTable = dT.Clone();
Now all you have to do is to call this routine after your grid has loaded.
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