can we nested try catch block

Try 

{

    con.Open(); 

}

catch(SQlException ex) //if there is an Error Catch it here 

{

   Label1.Text = ex.Message; //Display your Error in the Message



}

Finally  //Finnaly dispose all the objects and Close the Connection 

{

  if (con != null)

      {

                    con.Close();

       }

}

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[Administrator]

try

{

    try

    {

        DoEverything(); 

    }

    catch (Exception ex)

    {

        

    }

}

catch (Exception ex)

{



}