"Object reference not set to an instance of an object" error

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I want to create connection string and use it to all forms in my application but is showing error.

Below is my code but its showing error "Object reference not set to an instance of an object"

Please Help!!!!!!!

What I have tried:

VB.NET

mports System.Data.SqlClient
Imports System.Data.OleDb

Module sqlserverconnectionstring
    Public connsql As SqlConnection    
    Dim connstr As String     

    Public Sub sqlserverconnection()
        Try
             connstr = "Provider=SQLOLEDB.1; Data Source=" & My.Settings.sqlservername & ";Initial Catalog=" & My.Settings.sqlDBname & ";Password=" & My.Settings.sqlPswd & ";User ID=" & My.Settings.sqlUserName
             connsql.Open()

        Catch ex As Exception
            MsgBox(ex.Message.ToString)

        End Try
    End Sub
    Public Sub sqlserverdisconnectdatabase()
        Try
            connsql.Close()
        Catch myerror As SqlClient.SqlException

        End Try
    End Sub
End Module

Posted 25-Oct-16 20:01pm

sufyankadri

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2 solutions

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Midi_Mick · Accepted Answer · 2016-10-25T20:06:00

You haven't instantiated connsql. See bolded code:

VB

connstr = "Provider=SQLOLEDB.1; Data Source=" & My.Settings.sqlservername & ";Initial Catalog=" & My.Settings.sqlDBname & ";Password=" & My.Settings.sqlPswd & ";User ID=" & My.Settings.sqlUserName
connsql = New SqlConnection(connstr)
connsql.Open()

sufyankadri · Accepted Answer · 2016-10-25T20:23:00

Solution 2

connstr = "Data Source=" & My.Settings.sqlservername & ";Initial Catalog=" & My.Settings.sqlDBname & ";Password=" & My.Settings.sqlPswd & ";User ID=" & My.Settings.sqlUserName
connsql = New SqlConnection(connstr)
connsql.Open()

Posted 25-Oct-16 20:23pm