Cobol passing parameters form C#

I have a form in C# that receives a parameter would like the cobol call this program passing this parameter, the form would open and show what came from cobol?

namespace nomeprograma
{
public partial class Form1 : Form
{

public Form1()
{
InitializeComponent();
}

public void QualMsg(string MSG)
{
campo.Text = MSG;
}

}

}

Thank you!