How to resolve my problem

string temp2 = grdView.Rows[i].Cells[3].Text;

<itemtemplate>
                <asp:Label ID="lblComments" runat="server" Text='<%# Bind("Comments") %>'>
                <asp:TextBox ID="txtComments" runat="server">
            </itemtemplate>

string temp2 = grdView.Rows[i].Cells[3].Text;

protected void btnUpdae_Click(object sender, EventArgs e)
        {
            string connection = System.Configuration.ConfigurationManager.ConnectionStrings["QuestionnaireConnection"].ConnectionString;
            using (SqlConnection con = new SqlConnection(connection))
            {
                con.Open();

                if (grdView.Rows.Count > 0) //[here the row count is zero 
                {
                    foreach (GridViewRow row in grdView.Rows) //[if I have break point here I am not getting into the loop] 
                    {
                        for (int i = 0; i < grdView.Rows.Count; i++)
                        {
                            Question qs = new Question();
                            string name = Request.QueryString["UserName"];
                            string temp1 = grdView.Rows[i].Cells[0].Text;
                            string temp2 = grdView.Rows[i].Cells[3].Text;

                            SqlDataAdapter da;
                            da = new SqlDataAdapter("UPDATE Questionnaire_UserAnswers SET Comments='" + temp2 + "' WHERE Question_ID=" + temp1 + "", con);
                            DataSet ds = new DataSet();

                            da.Fill(ds);
                            grdView.DataSource = ds;
                        }

                        grdView.EditIndex = -1;
                        ShowGridBindData();
                        lblmessage.Visible = true;
                        lblmessage.Text = "Record Updated Successfully";
                    }
                }