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My code below work and give result in load form and not result in selectedchangedevent combobox why

My code below work and give result in load form and not result in selectedchangedevent combobox why

My code below work and give result in load form and not result in selectedchangedevent combobox why

(OP)
I have combobox i want to show data in selectedindex changed event but it not accept although this code retrieve data in load event of form

private void bind1()

{


con.Open();

da = new SqlDataAdapter("Select NationalityID,NationalityName from Nationality", con);

dt = new DataTable();

da.Fill(dt);


SqlConnection con = new SqlConnection("Data Source=" + value1 + ";Initial Catalog=" + value2 + ";User ID=" + value3 + ";Password=" + value4 + "");// DataRow dr;


dr = dt.NewRow();


dr.ItemArray = new object[] { 0, "---Select Nationality---" };


dt.Rows.InsertAt(dr, 0);

comboBox2.DisplayMember = "NationalityName";

comboBox2.ValueMember = "NationalityID";

comboBox2.DataSource = dt;

comboBox2.Refresh();

con.Close();

}

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)

{

bind1();

}

this code above work fine and retrieve data in combobox by load event but i need to work in selected index changed event combobox

Why not retrieve data in selected index changed event of combobox
I work in windows application c#
and how i do that

RE: My code below work and give result in load form and not result in selectedchangedevent combobox why

Didn't you forget to call databind>

e.g. after

comboBox2.DataSource = dt;
call..
comboBox2.DataBind();

RE: My code below work and give result in load form and not result in selectedchangedevent combobox why

Sorry forget the last answer. I think that isn't necessary in winforms, just webforms.
Its been a long time since I have worked in a winforms app..

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