Retrieve Column Name From A Database Table In VB.NET

This article describes how to use ado.net to connect to a database and fetch the column name from the database table.
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This article describes how to use ado.net to connect to a database and retrieve the columns name from the database table. To do that we create a table in database and using select statement, DataAdapter, Dataset to retrieve the column's name of the table.  

Creating connection object

To create a connection we pass the connection string as a parameter in connection object.

Dim str As String = "Data Source=.;uid=sa;pwd=123;database=master"

Dim con As New SqlConnection(str)

 

The above string defines the connection string which is used to connect the database with the application.

 

Now we create a database table and insert some values in this table. Table looks like this.

 

create table logn

(

username varchar(50),

password varchar(40)

)

go

insert into logn values('monu','mohan')

go

insert into logn values('Rohatash','rohit')

go

insert into logn values('Manoj','singh')

go

select * from logn;

The table looks like this.

 

OUTPUT


 

output-in-vb.net.gif

For example

 

The below code define how to retrieve column name from the database table.

 

Imports System.Data.SqlClient

Module Module1

    Sub Main()

        Dim str As String = "Data Source=.;uid=sa;pwd=123;database=master"

        Dim con As New SqlConnection(str)

        Dim str1 As String = "SELECT * FROM logn"

        Dim cmd As New SqlCommand(str1, con)

        Dim da As New SqlDataAdapter(cmd)

        Dim ds As New DataSet()

        da.Fill(ds, "logn")

        Dim dc As DataColumn

        For Each dc In ds.Tables(0).Columns

            Console.Write("{0,15}", dc.ColumnName)

        Next

        Console.WriteLine("")

    End Sub

End Module

 

OUTPUT


vb.net-command-prompt.gif

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