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‘Object reference not set to an instance of an object.’ using a windows form
I have two windows form that I display modally and a connection string set to the one form.
The connection string is in the process of connecting to the database. When using the connection string from the first form, the code works. However, when I go back to the second form, I get the following error:
System.NullReferenceException: Object reference not set to an instance of an object.
I’ve tried the following things but the error persists:
Passing the connection string as a parameter.
Using a static connection string.
Checking if the connection string is null.
Releasing the connection string from the Form1 first.
I have a feeling that something is caching the connection string and using the cached object. How do I stop this from happening?
A:
This is happening because when you create the Form1, it assigns the value to your ConnectionString property.
There are many different ways to solve this issue, but the most common is to remove the connection string from the Form1 at form load.
Code:
using System.Data.SqlClient;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
// Remove the connection string from the Form1.
// Replace it with new value.
// Use the static instance.
//…
}
}
But if you want to pass the connection string as a parameter, you need to make sure that the connection string being passed is at the right namespace.
Code:
using System;
using System.Data;
using System.Data.SqlClient;
namespace MyApp
{
public partial class Form1 : Form
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