I'm trying to pass a parameter in a SqlDataSource thru OnRowUpdating event in a Gridview control and i get... Cannot insert the value NULL into column

protected void uxChecksGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        GridView g = (GridView)sender;
        RadioButtonList r = (RadioButtonList)g.Rows[e.RowIndex].FindControl("uxAddAddressRadioButtonList");
 
        uxChecksSqlDataSource.UpdateParameters["HasAddress"].DefaultValue = r.SelectedValue;
 
        if (Convert.ToBoolean(r.SelectedValue))
        {
            TextBox a = (TextBox)g.Rows[e.RowIndex].FindControl("uxCheckAddressTextBox");
            TextBox c = (TextBox)g.Rows[e.RowIndex].FindControl("uxCheckCityTextBox");
            DropDownList s = (DropDownList)g.Rows[e.RowIndex].FindControl("uxCheckStateDropDownList");
            TextBox z = (TextBox)g.Rows[e.RowIndex].FindControl("uxCheckZipTextBox");
 
            uxChecksSqlDataSource.UpdateParameters["Address"].DefaultValue = a.Text;
            uxChecksSqlDataSource.UpdateParameters["City"].DefaultValue = c.Text;
            uxChecksSqlDataSource.UpdateParameters["State"].DefaultValue = s.SelectedValue;
            uxChecksSqlDataSource.UpdateParameters["Zip"].DefaultValue = z.Text;
        }
    }
 
aspx
 
    <asp:SqlDataSource ID="uxChecksSqlDataSource" runat="server"
                       ConnectionString="<%$ ConnectionStrings:db %>"
                       SelectCommandType="StoredProcedure"
                       SelectCommand="sp_GetChecksInformation"
                       DeleteCommandType="StoredProcedure"
                       DeleteCommand="sp_DeleteChecks"
                       InsertCommandType="StoredProcedure"
                       InsertCommand="sp_InsertChecks"
                       UpdateCommandType="StoredProcedure"
                       UpdateCommand="sp_UpdateChecks">
        <SelectParameters>
            <asp:SessionParameter Name="DID" SessionField="DID" />
        </SelectParameters>  
        <DeleteParameters>
            <asp:SessionParameter Name="DID" SessionField="DID" />
            <asp:Parameter Name="ID" Type="Int32" />        
        </DeleteParameters>   
        <InsertParameters>
            <asp:Parameter Name="DID" />
            <asp:Parameter Name="CashiersCheck" />          
            <asp:Parameter Name="PayableTo" />
            <asp:Parameter Name="Amount" />
            <asp:Parameter Name="Purpose" />  
            <asp:Parameter Name="HasAddress" />              
            <asp:Parameter Name="Address" />
            <asp:Parameter Name="City" />
            <asp:Parameter Name="State" />
            <asp:Parameter Name="Zip" />                             
         </InsertParameters> 
         <UpdateParameters>
            <asp:Parameter Name="CashiersCheck" />
            <asp:Parameter Name="PayableTo" />     
            <asp:Parameter Name="Amount" />    
            <asp:Parameter Name="Purpose" />              
            <asp:Parameter Name="Address" />
            <asp:Parameter Name="City" />
            <asp:Parameter Name="State" />
            <asp:Parameter Name="Zip" />  
            <asp:Parameter Name="HasAddress" />
            <asp:SessionParameter Name="DID" SessionField="DID" />
            <asp:Parameter Name="ID" Type="Int32" />                  
         </UpdateParameters>               
    </asp:SqlDataSource>

                                  

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