System.NullReferenceException: 'Object reference not set to an instance of an object.'
Dim conexion As SqlConnection
conexion.ConnectionString = "integrated security=SSPI;data source=LAPTOP-2QDQLE6A\SQLEXPRESS;" & "persist security info=False;initial catalog=Estudiantes"
Can someone help me with this error?
The problem is that in the first line you are declaring a variable of type SqlConnection but if you do not instantiate it, you keep the value null
What you must do is in that same line assign a value, in this case creating a new instance of SqlConnection mediante keyword New
Dim conexion As New SqlConnection
conexion.ConnectionString = "integrated security=SSPI;data source=LAPTOP-2QDQLE6A\SQLEXPRESS;" & "persist security info=False;initial catalog=Estudiantes"