Error-Object reference is required for non-static field

I have below code but i am getting above error on CreateConnection();

    static class Program
    {
        public static SAPbouiCOM.Application oApplication = null;
        public static SAPbobsCOM.Company oCompany = null;

        [STAThread]
        static void Main(string[] args)
        {
            try
            {
                CreateConnection();
                Menu oMenuItems = null;
                oMenuItems = new Menu();

                //  Start Message Loop
                System.Windows.Forms.Application.Run();
            }
            catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }
        }
    }

Thanks

This error occurs when trying to access an instance member from a static context. I think CreateConnection() is likely an instance method, and you're trying to call it from a static context in your Main method. If possible, make the CreateConnection() method to be static if it doesn't rely on instance-specific data. For example:

static void CreateConnection()
{
    // Your connection logic here
}

Otherwise you'll need to create an instance of the class it belongs to and then call the method on that instance. For example:

static void Main(string[] args)
{
    try
    {
        Program program = new Program();
        program.CreateConnection();

        Menu oMenuItems = new Menu();
        System.Windows.Forms.Application.Run();
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
    }
}

public void CreateConnection()
{
    // Your connection logic here
}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Amit Mohanty2y ago
Accepted answer
This error occurs when trying to access an instance member from a static context. I think CreateConnection() is likely an instance method, and you're trying to call it from a static context in your Main method. If possible, make the CreateConnection() method to be static if it doesn't rely on instance-specific data. For example:
```
static void CreateConnection()
{
    // Your connection logic here
}
```
Otherwise you'll need to create an instance of the class it belongs to and then call the method on that instance. For example:
```
static void Main(string[] args)
{
    try
    {
        Program program = new Program();
        program.CreateConnection();

        Menu oMenuItems = new Menu();
        System.Windows.Forms.Application.Run();
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
    }
}

public void CreateConnection()
{
    // Your connection logic here
}
```
+3