Run a query based on the dropdownlist value.

Question

Hi I need to run a select query in order to retrieve value in to the readonly textbox based on ddl value. Regards.

Satyapriya Nayak · Answer

Untitled Page onselectedindexchanged=DropDownList1_SelectedIndexChanged> using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; namespace Dropdownlist_click_data_in_textbox { public partial class _Default : System.Web.UI.Page { string strConnString = ConfigurationManager.ConnectionStrings[ConnectionString].ConnectionString; string str; SqlCommand com; protected void Page_Load(object sender EventArgs e) { DropDownList1.AutoPostBack = true; SqlConnection con = new SqlConnection(strConnString); if (!IsPostBack) { DropDownList1.Items.Add(Choose id); con.Open(); str = select * from test; com = new SqlCommand(str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { DropDownList1.Items.Add(reader[id].ToString()); } reader.Close(); con.Close(); } } protected void DropDownList1_SelectedIndexChanged(object sender EventArgs e) { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select * from test where id=' + DropDownList1.SelectedItem.Text + '; com = new SqlCommand(str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { TextBox1.Text = reader[name].ToString(); } reader.Close(); con.Close(); } } }