How to call mainform method in another form in user control.

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C#

I am working with windowsFrom in c#. I am trying to call mainfrom method in one of the from in user control.
I have mainfrom like this

namespace Project
   {
     public partial class MainForm : Form
      {
       public MainForm()
       {
           InitializeComponent();
       }

       public void TempCommand()
         {
          StartTemp();
         }
      }
    }

I have the button click in the user control. When i click that button then it will open another form. I have the code like this in the user control.

private TempCalib _tempCalib = new TempCalib();
 
       private void calibBtn_Click(object sender, EventArgs e)
        {
            _tempCalib.Show();
        }

it will open another from and i have one button in that from. I need to call mainfrom method when i click "Ok" button in this from.

namespace Project
  {
  public partial class TempCalib : Form
  {

      public TempCalib()
      {
          InitializeComponent();
      }

      private void OkButton_Click(object sender, EventArgs e)
      {
         // I need to call the mainfrom "TempCommand" method here.
          this.Hide();
      }


     }
   }

Can anyone help me how to do this.

Thanks.