C#

FileStream baseStream = new FileStream("path", FileMode.CreateNew);

public int CheckFile()
{
...
     if(!cmdNew.Exists) // this is the same as cmdNew.Exists == false
     {
          ...
          if(Result == DialogResult.Yes)
               return -1;
     }
...
return 1; //or some other value which is not -1
}

private void cmdAdd_Click(object sender, System.EventArgs e)
{
     if(CheckFile() == -1)
          return;

     // The code below here should not get executed if CheckFile returned -1:
     AddDc frmAddDC = new AddDC();
     ...
}

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<code>
...
myForm.Text = "Some Title";
...

<code>
...
this.Text = "Some Title";
...

//Inside Shared Assembly
[assembly:InternalsVisibleTo("Runtime")]

public class SharedClass
{
   private string info;
   
   public string Info
   {
      get
      {
         return info;
      }
   }

   internal void SetInfo(string info)
   {
       this.info = info;  
   }
}