how to populate elements in drop down list

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In our project, we want the college name in drop down list from college table in drop down list's SelectedIndexChanged event.How I can get collge name in drop down list of that event.

The code written by us is as follow.

C#

protected void ddlCollegename_SelectedIndexChanged(object sender, EventArgs e)
    {
            objsqlconnection = new SqlConnection(strconnectionstring);
            string strquery1 = "select CollegeName from tblCollege_Info";
            objsqlcommand = new SqlCommand(strquery1, objsqlconnection);
           
            try
            {
                objsqlconnection.Open();
                SqlDataReader objreader = objsqlcommand.ExecuteReader();
                while (objreader.Read())
                {
                  
                    ddlCollegename.Items.Add(objreader[1].ToString());
                }
                objreader.Close();
            }
            catch
            {
                Console.WriteLine("Error!!!!!!!1");
            }
            finally
            {
                objsqlconnection.Close();
            }
}

Please Help me.
Thanks

[edit]Minor tweaks to code block - OriginalGriff[/edit]

Posted 3-Aug-11 0:31am

Ujwala Gholap

Updated 3-Aug-11 0:39am

OriginalGriff

v2

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Comments

Ashika s 3-Aug-11 6:34am

for what purpose to get collegename in that event?

Ashika s 3-Aug-11 6:35am

just fill dropdown list and that function call in page load

Ashika s 3-Aug-11 6:36am

plz elaborate your question?

BobJanova 3-Aug-11 7:22am

You do not want to do this on SelectedIndexChanged. That causes the page to post back EVERY TIME the user picks a new college, and for no purpose (you are filling the list with the same items each time). Fill the dropdown once, in Page_Load.

2 solutions

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Syed Salman Raza Zaidi · Answer 1 · 2011-08-03T00:41:00

C#

objsqlconnection = new SqlConnection(strconnectionstring);
DataSet ds=new DataSet();
            string strquery1 = "select * from tblCollege_Info";
            objsqlcommand = new SqlCommand(strquery1, objsqlconnection);
OleDbAdapter a=new OleDbAdapter();
a.selectCommand=objsqlcommand;
a.fill(ds,"tblCollege_Info");
                     
 try
 {
                   ddlCollegename.DataSource=ds;
ddlCollegename.DataTextField="Collegename";
ddlCollegename.DataValueField="ID";//ie PK of your table
 
           }
            catch
            {
                Console.WriteLine("Error!!!!!!!1");
            }
            finally
            {
                objsqlconnection.Close();

Pravinjas · Answer 2 · 2011-08-03T00:42:00

Solution 2

use sqldatasource & configure it for college table.for dropdownlist select ur datasource

Posted 3-Aug-11 0:42am

Pravinjas