My RadComboBox
is supposed to drop down and display options for me to select. the options are name but the selected values are numbers corresponding to the ID of the center.
<telerik:RadComboBox DataValueField="OPERATION_CENTER_ID" RenderingMode="Full" EmptyMessage="Select Operation Center" DataTextField="OPERATION_CENTER_NAME" ID="RadComboBox1" runat="server"></telerik:RadComboBox>
protected void rdOrders_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e) { //Get OPERATION_CENTER_ID in f1 from f2 query (it is an int) string f2 = "select * from [dbo].[GetOperationCentersInfo]('F')"; SQLHelper a = new SQLHelper(SQLHelper.ConnectionStrings.EmallShippingConnectionString); int ID = RadComboBox1.SelectedValue; { string f1 = "select * from [dbo].[GetReadyDeliveryOrderItems](" + ID + ")"; DataTable DataTable1 = a.getQueryResult(f1); //Orders Query by OPERATION_CENTER_ID DataTable DataTable2 = a.getQueryResult(f2); //Operation centers Query DataTable testDataTable = new DataTable(); rdOrders.DataSource = DataTable1; RadComboBox1.DataSource = DataTable2; RadComboBox1.DataBind(); }
Basically when the user selects a value from RadComboBox1
, I want to store that value in an int
variable.
Hope that DataValueField
is assigned while binding the grid, and the Value is convertible to an integer. Then I would like to suggest int.TryParse
for this conversion, So that you use its return value to check whether the conversion is successful or not. See the code below:
int ID;
if(Int32.TryParse(RadComboBox1.SelectedValue,out ID))
{
// You can proceed with ID
}
else
{
// Conversion failed
}
Is there any particular reason that you have to data-bind your RadComboBox
control in a NeedDataSource
event? This will not guarantee that your RadComboBox
control will be loaded correctly due to the life cycle of your page/control.
What you possibly can do is to add your data-binding code to Page_Load
event, something like below.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindRadComboBox();
}
}
private void BindRadComboBox()
{
string f2 = "select * from [dbo].[GetOperationCentersInfo]('F')";
SQLHelper a = new SQLHelper(SQLHelper.ConnectionStrings.EmallShippingConnectionString);
int ID = RadComboBox1.SelectedValue; {
string f1 = "select * from [dbo].[GetReadyDeliveryOrderItems](" + ID + ")";
DataTable DataTable1 = a.getQueryResult(f1); //Orders Query by OPERATION_CENTER_ID
DataTable DataTable2 = a.getQueryResult(f2); //Operation centers Query
DataTable testDataTable = new DataTable();
rdOrders.DataSource = DataTable1;
RadComboBox1.DataSource = DataTable2;
RadComboBox1.DataBind();
}
You will need to double check the code that fetches the data though. Also for converting string to integer, please refer to un-lucky's answer, which is recommended way of doing it.
Hope this helps.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.