C# Passing values to another form

Question

Hi all,

I'm passing a bool from one form to another, I have tried declaring 'Private bool useDBServer;' at the top of my class but this create a new variable.

What am I doing wrong?

Thanks

Form1 below:

Form2 frm = new Form2(dataGridView1, _useDBServer, _useOther);

Form2 below:

    public Form2(DataGridView dgv, bool useDBServer, bool useOther)
    {
       if(useDBServer) //<---- works here
       {
         //stuff
       }
    }


    private void readRegistry()
    {
       if(useDBServer) //<---- but not here
       {
         //stuff
       }
    }

Answer 1

If you want to use the variable in a different method, you'll have to have it as an instance variable, and copy the value in the constructor:

private readonly bool useDBServer;

public Form2(DataGridView dgv, bool useDBServer, bool useOther)
{
   this.useDBServer = useDBServer; // Copy parameter to instance variable
   if(useDBServer) 
   {
     //stuff
   }
}


private void readRegistry()
{
   if(useDBServer) // Use the instance variable
   {
     //stuff
   }
}

Answer 2

public Form2(DataGridView dgv, bool _useDBServer, bool useOther)
    {
       useDBServer = _useDBServer;

       if(useDBServer) //<---- works here
       {
         //stuff
       }
    }

Answer 3

Do something like this:

bool localUseDBServer;

public Form2(DataGridView dgv, bool useDBServer, bool useOther)
{
   localUseDBServer = useDBServer;

   if(localUseDBServer)
   {
     //stuff
   }
}

private void readRegistry()
{
   if(localUseDBServer)
   {
     //stuff
   }
}

Answer 4

You're passing an argument to the constructor. How is that going to be used in a method within the class? You either need to 'save' the argument in an instance member variable. Or you need to forward the argument from the constructor to the method.