private void FrmGiris_Load(object sender, EventArgs e)
 {
     GrubGirisTürü.BringToFront();
     foreach (Control item in GrubKuLBilgiler.Controls)
     {
         if (item is GunaLineTextBox textBox)
         {
             watermark.TexboxCikis(item.Tag.ToString(), textBox);
         }
     }
 }
 private void PictureBack_Click(object sender, EventArgs e)
 {
     GrubGirisTürü.BringToFront();
 }