Question

I have web Service method that returns value of one column of a table. I want add that value to my drop down list. Is there any easy way to do it.

Here is my web method that returns all conference_name in conference table.

[WebMethod(Description = "Retrieves all Conference")]
        public DataSet GetAllConference()
        {
            DataSet dataSet = new DataSet();
            // Create connection object
            OleDbConnection oleConn = new OleDbConnection(connString);
            try
            {
                oleConn.Open();
                string sql = "SELECT conference_name FROM Conference";
                OleDbDataAdapter dataAdapter = new OleDbDataAdapter(sql, oleConn);
                dataAdapter.Fill(dataSet, "Conference");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            finally
            {
                oleConn.Close();
            }
            if (dataSet.Tables.Count <= 0)
                return null;
            else
                return dataSet;
        }

On user side there will be one dropdown list. How can i add the value return by the web method to the dropdown list.

Answer 1

You need to add web reference of web service in order to call the method, You may read this post to know how add reference, After adding reference you can call the method adn fill the drop down by the code given below,

DataSet ds = wsObject.GetAllConference();
if(ds.Tables.Count > 0)
{
   ddlist.DataTextField = "conference_name";
   ddlist.DataValueField = "conference_name"; //Change field to one you want.
   //ddlist.DataValueField = "IDColumnInTheDataTable"; //un comment after give right column name
   ddlist.DataSource = ds.Tables[0];
   ddlist.DataBind();
}