Retrieve data Grideview when SelectedIndexChanged

Question

Hi everybody

I have dropdown list contain all the University inserted in my database and I want when the event SelectedIndexChanged clicked to show a grideview contain data related to the selected item I created the gridview and I wrote this code when SelectedIndexChanged

protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)

{

string Grdvw = GridView1.Visible.ToString();

}

ToBe · Answer

Dear Satyapriya thank you for your reply i applied it to my code like the following but nothing happen to the page only the dropdownlist is shown :( Please Chose your Area: DataSourceID=SqlDataSource3 DataTextField=Area_Name DataValueField=Uni_ID> Please Chose the Street: DataSourceID=SqlDataSource4 DataTextField=University_Name DataValueField=Uni_ID AutoPostBack=True onselectedindexchanged=DropDownList3_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 UNIV_System { public partial class BY_UNI: System.Web.UI.Page { string strConnString = ConfigurationManager.ConnectionStrings[UNIConnectionString].ConnectionString; SqlCommand com; SqlDataAdapter sqlda; DataSet ds; string str; protected void Page_Load(object sender EventArgs e) { SqlConnection con = new SqlConnection(strConnString); if (!IsPostBack) { DropDownList3.Items.Add(Choose Id); con.Open(); str = select * from tblUni; com = new SqlCommand(str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { DropDownList3.Items.Add(reader[Ser_no].ToString()); } reader.Close(); con.Close(); } } protected void DropDownList3_SelectedIndexChanged(object sender EventArgs e) { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select * from tblUni where Ser_no=' + DropDownList3.SelectedItem.Text + '; com = new SqlCommand(str con); sqlda = new SqlDataAdapter(str con); ds = new DataSet(); sqlda.Fill(ds tblUni ); GridView1.DataMember = tblUni ; GridView1.DataSource = ds; GridView1.DataBind(); con.Close(); } } }

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_gridview { public partial class _Default : System.Web.UI.Page { string strConnString = ConfigurationManager.ConnectionStrings[ConnectionString].ConnectionString; SqlCommand com; SqlDataAdapter sqlda; DataSet ds; string str; protected void Page_Load(object sender EventArgs e) { SqlConnection con = new SqlConnection(strConnString); if (!IsPostBack) { DropDownList1.Items.Add(Choose Id); con.Open(); str = select * from employee; com = new SqlCommand(str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { DropDownList1.Items.Add(reader[empid].ToString()); } reader.Close(); con.Close(); } } protected void DropDownList1_SelectedIndexChanged(object sender EventArgs e) { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select * from employee where empid=' + DropDownList1.SelectedItem.Text + '; com = new SqlCommand(str con); sqlda = new SqlDataAdapter(strcon); ds = new DataSet(); sqlda.Fill(ds employee); GridView1.DataMember = employee; GridView1.DataSource = ds; GridView1.DataBind(); con.Close(); } } }