I have a grid with text box,

I change the text box to be AutoPostBack="true"

when I change the data I have event that insert the data to the DB.

Code:
  protected void mark_TextChanged(object sender, EventArgs e)
    {

        TextBox t = (TextBox)sender;
        GridViewRow grdRow = (GridViewRow)t.Parent.Parent;
  Label l = (Label)grdRow.FindControl("questionID");
// HERE I INSERT THE DATA TO THE DB
//TRY TO GO TO THE TEXT BOX IN THE NEXT ROW
      grdRow = new GridViewRow(grdRow.RowIndex + 1,grdRow.DataItemIndex,DataControlRowType.DataRow, DataControlRowState.Normal);          
                       l  = (Label)grdRow.FindControl("questionID"); //BREAK HERE
                       Page.ClientScript.RegisterStartupScript(this.GetType(), "aaa", "document.getElementById('" + l.ClientID + "').focus()", true);
how can I go th the next row in the grid.

thanks!