How to get 1 column data from DataTable and display it to Lable using VB.Net on ASP.Net
Question
I want to get 1 column data from a DataTable that has multiple column and only 1 row record using VB.Net. And then display the column data into a web page using ASP.Net.
In my case below, I want to get the Name column data from DataTable and then display it on a web page.
Here my VB.Net Code:
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Public Class TestDisplayData
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Create a Connection Object
Dim connectionString As String
Dim connection As SqlConnection
connectionString = ConfigurationManager.ConnectionStrings("SQLDbConnection").ToString
connection = New SqlConnection(connectionString)
'Create SQL Command
Dim SQL As String = "SELECT Name, Title, Phone FROM contacts"
'Open the Connection
connection.Open()
'Create DataAdaptor Object
Dim Adaptor As SqlDataAdapter = New SqlDataAdapter()
Adaptor.SelectCommand = New SqlCommand(SQL, connection)
'Close the Connection
connection.Close()
'Create DataTable Object
Dim dt As DataTable = New DataTable()
'Fill DataTable
Adaptor.Fill(dt)
'I am not sure what next code are. I want to get the Name column from the DataTable
End Sub
End Class
Here my HTML ASP.Net code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Name: (I want to display the Name column data here)
</div>
</form>
</body>
</html>
3 answers
solution1
2 ACCPTED 2019-04-10 04:59:28
以下是仅选择一列的代码：
dt.Rows.Item(0).Item("Name")
solution2
0 2019-04-10 04:33:00
You can use Take(1) click here to see or FirstorDefault() check it here
I will share one example rest you can check above link official document.
dt.AsEnumerable().Take(1).[Select](Function(s) s.Field(Of String)("Name"))
solution3
0 2019-04-10 06:01:02
<asp:Label ID="lblname" runat="server" Text=""></asp:Label>
Code Behind
lblname.text=dt.Rows[0]["Name"].ToString(); VB Code
lblname.text=dt.Rows(0).Item("Name").ToString()
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