Row Editing Retrieve Datakeys in GridView

Row Editing Retrieve Datakeys in GridView
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protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
string GrdUserName= GridView1.DataKeys[e.NewEditIndex].Values[0].ToString();
string GrdPassword = GridView1.DataKeys[e.NewEditIndex].Values[1].ToString();

GridView1.EditIndex = e.NewEditIndex;
LoadGrid();
}
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowFooter="true" DataKeyNames ="username,password">
</asp:GridView>