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Introduction:

Here I will explain how to add or bind datatable column data with comma separated values in asp.net.

Description:

In previous article I explained about self join in SQL server, Joins in SQL Server and many more articles relating to SQL Server. Now I will explain how to add datatable data with comma separated values in asp.net.

If we want to bind the datatable column data with comma operator we need to write syntax like this

C# Code


DataTable dt = new DataTable();
string str = string.Empty;
for (int i = 0; i < dt.Rows.Count; i++)
{
str = str + dt.Rows[i]["UserName"].ToString();
str += (i < dt.Rows.Count-1) ? "," : string.Empty;
}
VB.NET Code


Dim dt As New DataTable()
Dim str As String = String.Empty
For i As Integer = 0 To dt.Rows.Count - 1
str = str & dt.Rows(i)("UserName").ToString()
str += If((i < dt.Rows.Count - 1), ",", String.Empty)
Next
Now I will explain this with one with simple example for that first design your aspx page like this


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Bind or Add Datatable data with Comma Separated values</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lblUserName" runat="server" />
</div>
</form>
</body>
</html>
Now open code behind page and add the following namespace references


using System;
using System.Data;
using System.Data.SqlClient;
After add namespaces write the following code in code behind

C# code


protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
BindData();
}
}
private void BindData()
{
SqlConnection con = new SqlConnection("Data Source=SureshDasari;Initial Catalog=MySampleDB;Integrated Security=true");
con.Open();
SqlCommand cmd = new SqlCommand("SELECT UserName FROM UserDetails",con);
SqlDataAdapter da=new SqlDataAdapter(cmd);
DataSet ds=new DataSet();
DataTable dt=new DataTable();
da.Fill(ds);
dt = ds.Tables[0];
string str = string.Empty;
for (int i = 0; i < dt.Rows.Count; i++)
{
str = str + dt.Rows[i]["UserName"].ToString();
str += (i < dt.Rows.Count-1) ? "," : string.Empty;
}
lblUserName.Text = str;
}
VB.NET Code

Imports System.Data
Imports System.Data.SqlClient
Partial Class Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load

If Not IsPostBack Then
BindData()
End If
End Sub
Private Sub BindData()
Dim con As New SqlConnection("Data Source=SureshDasari;Initial Catalog=MySampleDB;Integrated Security=true")
con.Open()
Dim cmd As New SqlCommand("SELECT UserName FROM UserDetails", con)
Dim da As New SqlDataAdapter(cmd)
Dim ds As New DataSet()
Dim dt As New DataTable()
da.Fill(ds)
dt = ds.Tables(0)
Dim str As String = String.Empty
For i As Integer = 0 To dt.Rows.Count - 1
str = str & dt.Rows(i)("UserName").ToString()
str += If((i < dt.Rows.Count - 1), ",", String.Empty)
Next
lblUserName.Text = str
End Sub
End Class
 If we run above code we will get output like this

Output


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