[2.0] Hide frmMain from frmEdit?

[Tural]

I'm working on a program, and I'm completely done, except for one small problem. I need to hide frmMain if a function in frmEdit is successful.

            try
            {
                FileStream fs = File.Open(Interaction.Command(), FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
                BinaryReader br = new BinaryReader(fs);
                BinaryWriter bw = new BinaryWriter(fs);

                //Go to offset
                br.BaseStream.Position = 444;
                //Show string
                strString = br.ReadString();
                txtSString.Text = strString;
                //Close br
                br.Close();

                frmMain.Hide();
            }

However, it seems that frmMain.Hide(); doesnt work, is there a bit of code that could do this?