web application query for connection to database in Visual studio 2010

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this code gives the errors in connection as

[]
Dim strConnString As [String] = System.Configuration. _

ConfigurationManager.ConnectionStrings("conString")_.ConnectionString()

Dim con As New SqlConnection(strConnString)

Dim strQuery As String = "select * from tb order by id"

Dim cmd As New SqlCommand(strQuery)

Dim sda As New SqlDataAdapter()

cmd.CommandType = CommandType.Text

cmd.Connection = con

Try

con.Open()

sda.SelectCommand = cmd

sda.Fill(dt)

GridView1.DataSource = dt

GridView1.DataBind()

Catch ex As Exception

Response.Write(ex.Message)

Finally

con.Close()

sda.Dispose()

con.Dispose()

Posted 6-Jan-13 11:37am

Member 9699512

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Christian Graus · Answer 1 · 2013-01-06T11:44:00

Well, your post is illegible, but, while your code is pretty awful ( you should never put your DB code in your presentation layer, for a start ), it looks to me like it should work. You need to tell us what the error is, or perhaps just read it ( we will tell you it means what it says ). Odds are good your connection string is broken or you can't connect to your DB at all.

Member 9699512 · Answer 2 · 2013-01-06T11:56:00

Solution 2

sorry for all this it has no error at compile time but when I execute it gives me the error of NULLReferenceException was unhandled by the user code

at this line

Dim strConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings("conString").ConnectionString

Posted 6-Jan-13 11:56am