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Hi friends.
I want to bind country,state,city to combobox.what i have done is country name has been bound to combobox1 at the page_load event. The below code for binding country on the page load event
stage(1)
int i = 3;
            DataTable dt = ibl2.combo1(i);
            countrycombo.DataSource = dt;
            countrycombo.DisplayMember =Convert.ToString( dt.Columns["Country_name"]);
            countrycombo.ValueMember = Convert.ToString(dt.Columns["Country_id"]);
country name successfully bound to contrycombobox.
stage(2)
The below code for bind statename at combobox1_selectedIndexChandged event
private void countrycombo_SelectedIndexChanged(object sender, EventArgs e)
       {
 
           string countyname = Convert.ToString( countrycombo.SelectedItem);
           DataTable ds = ibl2.statecombo(countyname);
           statecombo.DataSource = ds;
           if (ds != null)
           {
               statecombo.DisplayMember = Convert.ToString(ds.Columns["State_name"]);
               statecombo.ValueMember = Convert.ToString(ds.Columns["State_id"]);
           }
 

The problem occurrs on the second stage.Binding the state name to combobox2(statecombo) based on the country name.
The problem is when binding the statename to combobox2 at the combobox1_selectedIndexchanged event it take null value from country name.when i trace this process using f11 key, combox1_selectedItem event occur after the code
countrycombo.DataSource = dt;
in the page load itself so that it doesnt take any value from country combo box. what i need is this event should be occur after when i select the name of the country. what can i do.
Posted 7-Aug-12 22:37pm
Edited 7-Aug-12 23:49pm
v2
Comments
aspnet_regiis at 8-Aug-12 5:09am
   
incomplete information ..needs to see the complete code
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Solution 1

In the change event, check for a null selection and ignore it. Alternatively, do not add the delegate handler until a later point in your program, after the form has been loaded.
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Solution 2

Have a look on Windows Forms Databound Combobox - The Easy Way[^].
This might be useful for you.
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