Gridview Textbox - Empty String!

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ASP.NET

I have worked with grids before and they worked fine. Suddenly i am gettin this issue that whenever i try to add new course or edit an existing course name, the textbox value i enter returns an empty string! THerefore, a blank entry is made into the database! I have tried to debug, but i cannot understand why this is happening. Whatever i type in, turns into a blank string!

I am writing this grid in ajax tab control and ajax panel
i don't think that should cause an issue. I tried removing it from there but still same issues.

<asp:GridView ID="gvListCourses" runat="server" AllowPaging="True"
                                      CellPadding="1" CellSpacing="2" ShowFooter="True" DataKeyNames="CourseID"
                                      EmptyDataText="No courses available" AutoGenerateColumns="False"
                                      Width="292px">

                                     <AlternatingRowStyle CssClass="ProfileAlternateRow" />

                                     <Columns>
                                         <asp:TemplateField HeaderText="Course Name" SortExpression="Name">
                                             <EditItemTemplate>
                                                 <asp:TextBox ID="txtCourseName" runat="server" BorderColor="#999999"
                                                     BorderStyle="Solid" BorderWidth="1px" Height="25px" Width="240px"></asp:TextBox>
                                             </EditItemTemplate>
                                             <FooterTemplate>
                                                 <asp:TextBox ID="txtNewCourseName" runat="server"
                                                     BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" Height="25px"
                                                     Width="240px" MaxLength="150" Wrap="False"></asp:TextBox>
                                             </FooterTemplate>
                                             <ItemTemplate>
                                                 <asp:Label ID="Label1" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
                                             </ItemTemplate>
                                         </asp:TemplateField>
                                         <asp:TemplateField ShowHeader="False">
                                             <EditItemTemplate>
                                                 <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True"
                                                     CommandName="Update" Text="Update"></asp:LinkButton>
                                                 &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False"
                                                     CommandName="Cancel" Text="Cancel"></asp:LinkButton>
                                             </EditItemTemplate>
                                             <FooterTemplate>
                                                 <asp:LinkButton ID="lnkAddCourse" runat="server" CommandName="Add">Add...</asp:LinkButton>
                                             </FooterTemplate>
                                             <ItemTemplate>
                                                 <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
                                                     CommandName="Edit" Text="Edit"></asp:LinkButton>
                                             </ItemTemplate>
                                         </asp:TemplateField>
                                         <asp:CommandField ShowDeleteButton="True"/>
                                                                               </Columns>
                                     <FooterStyle CssClass="ProfileRow" />
                                     <HeaderStyle CssClass="ProfileChildHeader" />
                                     <PagerStyle CssClass="ProfileChildHeader" HorizontalAlign="Right" />

                                     <RowStyle CssClass="ProfileRow" />

                               </asp:GridView>

Protected Sub gvListCourses_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles gvListCourses.PageIndexChanging
    Try
        gvListCourses.PageIndex = e.NewPageIndex
        FillCourses()
    Catch ex As Exception
    End Try
End Sub
Protected Sub gvListCourses_RowCancelingEdit(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCancelEditEventArgs) Handles gvListCourses.RowCancelingEdit
    gvListCourses.EditIndex = -1
    FillCourses()
End Sub
Protected Sub gvListCourses_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gvListCourses.RowCommand
    Try
        If e.CommandName.Equals("Add") Then
            Dim txtCname As TextBox = CType(gvListCourses.FooterRow.FindControl("txtNewCourseName"), TextBox)
            If Not txtCname Is Nothing Then
                Dim akkad As New InstituteDefaults
                If akkad.AddCourse(txtCname.Text) > 0 Then
                    FillCourses()
                End If
            End If
        End If
    Catch ex As Exception
    End Try
End Sub
Protected Sub gvListCourses_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles gvListCourses.RowDeleting
    Try
        Dim Akkad As New InstituteDefaults
        If Akkad.DeleteCourse(gvListCourses.DataKeys(e.RowIndex).Values(0)) = True Then
            FillCourses()
        End If
    Catch ex As Exception
    End Try
End Sub
Protected Sub gvListCourses_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles gvListCourses.RowEditing
    Try
        gvListCourses.EditIndex = e.NewEditIndex
        FillCourses()
    Catch ex As Exception
    End Try
End Sub
Protected Sub gvListCourses_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles gvListCourses.RowUpdating
    Try
        Dim akkad As New InstituteDefaults
        Dim txtCName As TextBox = CType(gvListCourses.Rows(e.RowIndex).FindControl("txtCourseName"), TextBox)
        If Not txtCName Is Nothing Then
            If akkad.AddCourse(txtCName.Text, 0, gvListCourses.DataKeys(e.RowIndex).Values(0)) = True Then
                gvListCourses.EditIndex = -1
                FillCourses()
            End If
        End If
    Catch ex As Exception
    End Try
End Sub