Gridview Error

I have a gridview and am having some trouble referencing the ZipCode field.  

Code Behind
 Protected Sub btnAddSelectedCoverage_Click(sender As Object, e As EventArgs) Handles btnAddSelectedCoverage.Click
        Dim cnn As New System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("myprovalConnectionString").ConnectionString)
        Try
            For Each gvRow As GridViewRow In gdvZipList.Rows
                Dim chkBox As CheckBox = CType(gvRow.FindControl("RowLevelCheckBox"), CheckBox)
                Dim zip As TextBox = CType(gvRow.FindControl("ZipCode"), TextBox)
                If chkBox.Checked Then
                    Dim cmd As New System.Data.SqlClient.SqlCommand
                    cmd.Connection = cnn
                    cmd.CommandType = Data.CommandType.StoredProcedure
                    cmd.CommandText = "dbo.VendorCoverageInsert"

                    cmd.Parameters.Add("@VendorId", Data.SqlDbType.VarChar).Value = Session("VendorId").ToString
                    cmd.Parameters.Add("@UserId", Data.SqlDbType.VarChar).Value = Session("VendorId").ToString
                    cmd.Parameters.Add("@Selected", Data.SqlDbType.Bit).Value = chkBox.Checked
                    cmd.Parameters.Add("@Coverage", Data.SqlDbType.Char).Value = zip.ToString

                    cnn.Open()
                    cmd.ExecuteScalar()
                    cnn.Close()
                End If
            Next
            Dim dt As New System.Data.DataTable
            Dim sRedirect As String = "VendorAddEditCoverage.aspx?VID=" + Session("VendorId").ToString
            Response.Redirect(sRedirect)
        Finally
            cnn.Close()
        End Try
    End Sub

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Gridview
<asp:GridView ID="gdvZipList" runat="server" AutoGenerateColumns="False" 
                            CssClass="mGrid" Width="257px">
                            <Columns>
                                <asp:TemplateField HeaderText="Select">
                               
            <EditItemTemplate>
                                        <asp:CheckBox ID="RowLevelCheckBox" runat="server" Checked='<%# Bind("ZipCode") %>' />
                                    </EditItemTemplate>
                                    <ItemTemplate>
                                        <asp:CheckBox ID="RowLevelCheckBox" runat="server" Checked='<%# Bind("ZipCode") %>' 
                                            Enabled="true" />
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:BoundField DataField="ZipCode" HeaderText="Zip Code" />
                            </Columns>
                             
                        </asp:GridView>

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rcowen00Asked:
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Tom BeckCommented:
If zip is a textbox, then its value would be zip.Text rather than zip.ToString.
0
rcowen00Author Commented:
I switched it to .text and still getting the Object reference not set to an instance of an object. error.
0
Tom BeckCommented:
Oh, I see now the ZipCode field is a bound field. In that case you don't want to cast it as a textbox. You can access its value directly if you know the row and column. The row is whatever row the loop is currently on so...

cmd.Parameters.Add("@Coverage", Data.SqlDbType.Char).Value = gvRow.Cells(2).Text

...where 2 is the column number (zero index).
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