Question

I am executing a sql query, and I am getting an error Value cannot be null.
Parameter name: dataTable

Code:

                strSQLHost = "select HostBase.AppName from HostBase where HostBase.appid=0" 
                Dim dtHost As DataTable
                Dim daHost As SqlDataAdapter = New SqlDataAdapter(strSQLHost, conn)
                daHost.Fill(dtHost)

The error occurs at the daHost.Fill(dtHost)
When I run this query in SQL Enterprise manager, I get a value of ‘None’. It’s a valid value, not a null value.

How can I resolve this?

Answer 1

remove the last ' on your statement

I think it should read like this:

strSQLHost = "select Host.AppName from HostBase where HostBase.appid=0"

And instantiate your DataTable before passing it in:

Dim dtHost As DataTable = new DataTable()