Row Update

[krisssgopi]

Hi team,

i am using grid view row updating method. It was throwing an exception object reference not set to an instance. please advice me on which it was going wrong. please suggest me any other way to fix it.

Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating
        Dim textbox1, textbox2, textbox3 As New TextBox
        'GridViewRow(row = GridView1.Rows(e.RowIndex))
        Dim row As GridViewRow
        row = GridView1.Rows(e.RowIndex)
        textbox1 = row.FindControl("textbox1")
        textbox2 = row.FindControl("textbox2")
        textbox3 = row.FindControl("textbox3")
        'doupdate(textbox1, textbox2, textbox3)
        con.Open()
        cmd = New MySqlCommand("insert into login where username='" & textbox1.Text & "','" & textbox2.Text & "','" & textbox3.Text & "'", con)
        da = New MySqlDataAdapter(cmd)
        ds = New DataSet
        cmd.ExecuteNonQuery()
        MsgBox("inserted successfully...")
        da.Fill(ds)
        GridView1.DataSource = ds
        GridView1.DataBind()
    End Sub