Can we bind the data for multiple dropdownblist in C#?

Question

1.00/5 (1 vote)

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I am having 3 dropdownlist in a webform so i want to bind the data from SQL database, i am able to do it for one dropdownlist.. how to bind the data for other two dropdownlist from same sqldatabase...

my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Expense_System
{
    public partial class Transactions : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            String strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;

            SqlConnection con = new SqlConnection(strConnString);

            con.Open();

            SqlCommand cmd = new SqlCommand("select * from Expense_Type",con);

            DropDownListexpensetype.DataSource = cmd.ExecuteReader();
            DropDownListexpensetype.DataTextField = "Expense_Type";
            DropDownListexpensetype.DataValueField = "Expense_Type";
            DropDownListexpensetype.DataBind();


          

        }

        protected void BtncreateExpense_Click(object sender, EventArgs e)
        {
            String strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;

            SqlConnection con = new SqlConnection(strConnString);

            con.Open();

            SqlCommand cmd = new SqlCommand();

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.CommandText = "[dbo].[Spcreatetransactions]";

            cmd.Parameters.Add("@Payee", SqlDbType.VarChar).Value = tbpayee.Text;
            cmd.Parameters.Add("@Date", SqlDbType.Date).Value = tbdate.Text;
            cmd.Parameters.Add("@AMOUNT", SqlDbType.Int).Value = tbamount.Text;
            cmd.Parameters.Add("@expensetype", SqlDbType.VarChar).Value = DropDownListexpensetype.Text;
            cmd.Parameters.Add("@person ", SqlDbType.Int).Value = DropDownListperson.Text;
            cmd.Parameters.Add("@card ", SqlDbType.Int).Value = DropDownListcard.Text;

            cmd.Connection = con;

            int totalrecords = (int)cmd.ExecuteNonQuery();
            Response.Write("The number of created transactions is" + totalrecords.ToString());


            con.Close();

        }

    }
}

What I have tried:

i have tried like this also but not working, it was throwing unhandledexception error.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Expense_System
{
    public partial class Transactions : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            String strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;

            SqlConnection con = new SqlConnection(strConnString);

            con.Open();

            SqlCommand cmd = new SqlCommand("select * from Expense_Type",con);

            DropDownListexpensetype.DataSource = cmd.ExecuteReader();
            DropDownListexpensetype.DataTextField = "Expense_Type";
            DropDownListexpensetype.DataValueField = "Expense_Type";
            DropDownListexpensetype.DataBind();


            SqlCommand cmd2 = new SqlCommand("select * from [dbo].[User_details]", con);

            DropDownListperson.DataSource = cmd2.ExecuteReader();
            DropDownListperson.DataTextField = "Full_Name";
            DropDownListperson.DataValueField = "Full_Name";
            DropDownListperson.DataBind();

        }

        protected void BtncreateExpense_Click(object sender, EventArgs e)
        {
            String strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;

            SqlConnection con = new SqlConnection(strConnString);

            con.Open();

            SqlCommand cmd = new SqlCommand();

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.CommandText = "[dbo].[Spcreatetransactions]";

            cmd.Parameters.Add("@Payee", SqlDbType.VarChar).Value = tbpayee.Text;
            cmd.Parameters.Add("@Date", SqlDbType.Date).Value = tbdate.Text;
            cmd.Parameters.Add("@AMOUNT", SqlDbType.Int).Value = tbamount.Text;
            cmd.Parameters.Add("@expensetype", SqlDbType.VarChar).Value = DropDownListexpensetype.Text;
            cmd.Parameters.Add("@person ", SqlDbType.Int).Value = DropDownListperson.Text;
            cmd.Parameters.Add("@card ", SqlDbType.Int).Value = DropDownListcard.Text;

            cmd.Connection = con;

            int totalrecords = (int)cmd.ExecuteNonQuery();
            Response.Write("The number of created transactions is" + totalrecords.ToString());


            con.Close();

        }

    }
}

Posted 18-Jul-18 21:28pm

Virendra S from Bangalore, Karnataka

Updated 19-Jul-18 14:52pm

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Comments

Simon_Whale 19-Jul-18 6:23am

what is the exception message?

2 solutions

Solution 2

https://www.c-sharpcorner.com/UploadFile/d1558d/working-with-multiple-dropdownlist-using-Asp-Net/

Posted 18-Jul-18 22:14pm

abdul shakib

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Vincent Maverick Durano · Accepted Answer · 2018-07-19T14:53:00

You have to tell us which line causes the error.

Anyway, try this instead:

C#

protected void Page_Load(object sender, EventArgs e){
       if(!IsPostback){
	      BindAll();
       }  
	}
	
	private void BindAll(){
		BindExpenseList();
		BindPersonList();
	}
	
	private string GetConnectionString(){
		return ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
	}


	private void BindExpenseList(){
            using(SqlConnection con = new SqlConnection(GetConnectionString())){
            	using(SqlCommand cmd = new SqlCommand("select * from Expense_Type", con)){
			        con.Open();
            		DropDownListexpensetype.DataSource = cmd.ExecuteReader();
            		DropDownListexpensetype.DataTextField = "Expense_Type";
            		DropDownListexpensetype.DataValueField = "Expense_Type";
            		DropDownListexpensetype.DataBind();
	    	}
	    }
    }
	
	private void BindPersonList(){
            using(SqlConnection con = new SqlConnection(GetConnectionString())){
            	using(SqlCommand cmd = new SqlCommand("select * from [dbo].[User_details]", con)){
			        con.Open();
            		DropDownListperson.DataSource = cmd.ExecuteReader();
                    DropDownListperson.DataTextField = "Full_Name";
                    DropDownListperson.DataValueField = "Full_Name";
                    DropDownListperson.DataBind();
	    	}
	    }
    }

The idea is to decouple each binding in a separate method for you to easily maintain the code.