User-2051535749 posted
I have a gridview that when the user clicks [Edit], I populate a dropdown list. The dropdown is populated in code behind in the RowDataBound() method. When the users makes a selection I want to capture that value in my update method. In the update
method, I need to get the selected value and I'm unable to find the dropdown control.
How can I get the selected value of the drop down when in Edit Mode and from my update method?
Grid:
<asp:GridView ID="GridView" runat="server" DataKeyNames="Id"
AutoGenerateColumns="False" DataSourceID="GridViewDataSource2" GridLines="None"
AllowPaging="True" PageSize="25" OnRowDataBound="GridView_RowDataBound" OnRowUpdated="RowUpdated">
<Columns>
<asp:CommandField HeaderText="Edit" ButtonType="Image" CancelImageUrl="~/images/cancel.gif" EditImageUrl="~/images/edit.gif" ShowEditButton="True" UpdateImageUrl="~/images/save.gif">
<ItemStyle CssClass="GridViewEdit" />
</asp:CommandField>
<asp:BoundField DataField="ManufactureName" HeaderText="Manufacturer" SortExpression="Manufacturer" />
<asp:TemplateField ConvertEmptyStringToNull="False" HeaderText="Description">
<ItemTemplate>
<%#Eval("Manufacturer").ToString() %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="EditManu" runat="server" Text='<%# Bind("Manufacturer") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField ConvertEmptyStringToNull="False" HeaderText="Category">
<ItemTemplate>
<asp:Label ID="category" runat="server" Text='<%#Eval("PrimaryCategory").ToString() %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="Category" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState & DataControlRowState.Edit) == DataControlRowState.Edit)
{
DropDownList MainCategory = (DropDownList)e.Row.FindControl("Category");
Cat1.DataSource = GetManufacturers.Categories();
Cat1.DataTextField = "ManuName";
Cat1.DataValueField = "ManuId";
Cat1.DataBind();
}
}
protected void RowUpdated(object sender, GridViewUpdatedEventArgs e)
{
Manufacturer.Details manu = new Manufacturer.Details();
DropDownList Cat1 = (DropDownList)e.Row.FindControl("Category");
// get error object reference not set to an instance of an object
manu.Category = Cat1.SelectedItem.Value.ToString();
}
