How To Store and retrive ConnectionString from app.config file in vb.net project

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Hello
I am trying to fetch connection string from app.config, i have created a connection class and declareing a string which will stores connection string fetched from app.config file

 Public Class ConnectionClassDim 

ConString As String = ConfigurationManager.ConnectionStrings ("ConString").ConnectionString
'Here It will not reading Connectionstring from App.Config What to do for it?
    

    Dim con As SqlConnection
    Dim cmd As SqlCommand
    Dim da As SqlDataAdapter
   
    Public Function GetData(ByVal Query As String) As DataTable

        Dim dt As New DataTable
        Try
            con = New SqlConnection(ConString)
            con.Open()
            da = New SqlDataAdapter(Query, con)

            da.Fill(dt)
            Return dt
        Catch ex As Exception
            Return dt
        End Try
    End Function
End Class

the app.config is like

XML

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <connectionStrings>
    <add name="ConString" connectionString="Data Source=DEV150;Initial Catalog=TrailDb;Integrated Security=false;User Id=sa;Password=sadev150;"
            providerName="System.Data.SqlClient"/>
  </connectionStrings>


</configuration>

Posted 13-Sep-11 23:52pm

Yatin Bhagat

Updated 13-Sep-11 23:55pm

v2

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Herman<T>.Instance 14-Sep-11 6:55am

you use a datadapter and conn.Open() but not conn.Close(). When using a dataadapter you can also omit conn.Open().

3 solutions

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Sant Osha · Answer 1 · 2011-09-14T00:03:00

Solution 2

You can use
System.Configuration.COnfigurationSettings.AppSettings["Key"]

Posted 14-Sep-11 0:03am

Sant Osha

Savalia Manoj M · Answer 2 · 2012-05-17T19:49:00

Hi
Please Try this

In Your App.Config file looks like

 <configuration>
  <connectionstrings>
    <add name="DBConnectionString">
      connectionString="Data Source=Manoj;Initial Catalog=Test;Persist Security Info=True;User ID=sa;Password=admin123"
      providerName="System.Data.SqlClient" />
  </add></connectionstrings>
</configuration>

Please Add Reference "System.Configuration.dll"

IN your code

// Add NameSpaces for
using System.Configuration;

string nwConn = System.Configuration.ConfigurationManager.ConnectionStrings[1].ToString();

OriginalGriff · Answer 3 · 2011-09-14T00:02:00

Solution 1

Move the read into your page load function - that way it will be done each time you need it.

Posted 14-Sep-11 0:02am

OriginalGriff

Comments

Yatin Bhagat 14-Sep-11 6:07am

i have created a seperate class for database operations only

OriginalGriff 14-Sep-11 7:15am

Then create a ConnectionString Property or a GetConnection method, and call it each time you need it. You can always test if you need to access the settings file by assigning an initial null.