asp.net - Cannot find table 0 error in C# -

i error when try execute stored procedure , null dataset.

private sqlconnection con = new sqlconnection(configurationmanager.connectionstrings["learnaspconnectionstring"].connectionstring);  protected void btnregister_click(object sender, eventargs e) {         try         {             con.open();             sqlcommand cmd = new sqlcommand("dbo.registerinsert", con);             cmd.commandtype = commandtype.storedprocedure;             sqlparameter p1 = new sqlparameter("@fname", txtfname.text);             sqlparameter p2 = new sqlparameter("@lname", txtlname.text);             sqlparameter p3 = new sqlparameter("@company", txtcompany.text);             sqlparameter p4 = new sqlparameter("@phone", txtphone.text);             sqlparameter p5 = new sqlparameter("@address", txtaddress.text);             sqlparameter p6 = new sqlparameter("@email", txtemail.text);             cmd.parameters.add(p1);             cmd.parameters.add(p2);             cmd.parameters.add(p3);             cmd.parameters.add(p4);             cmd.parameters.add(p5);             cmd.parameters.add(p6);             cmd.executenonquery();              con.close();             sqldataadapter da = new sqldataadapter(cmd);             dataset ds = new dataset();             da.fill(ds);             datatable dt = ds.tables[0];             listviewdetails.datasource = ds;             listviewdetails.databind();             lblmessage.visible = true;             lblmessage.text = "registration completed successfully!";         }         catch (sqlexception ex)         {         } } 

my stored procedure is:

   create procedure [dbo].[registerinsert]      -- add parameters stored procedure here     @fname nvarchar(50),     @lname nvarchar(50),     @company nvarchar(50),     @phone nvarchar(50),     @address nvarchar(250),     @email  nvarchar(250)           set nocount on;         insert [dbo].[register]     ([fname],      [lname],      [company],      [phone],      [address],      [email])      values      (@fname,       @lname,       @company,       @phone,       @address,       @email)     end 

i not able display data in listview control when run code.button click event stores values in database twice , gives error'cannot find table 0'.

please me let me know wrong in code.

thanks in advance.

the problem dataset not contain table objects. therefore ds.table[0] not exist , thrown error. add check ensure dataset has tables before proceeding.

    // check if ds has table     if(ds.tables.count>0)     {        //check if ds.table[0] has rows          if(ds.tables[0].rows.count>0){        //do     }  }