C# automatically fetch information - oledb access

OleDbConnection cn = new OleDbConnection();
           cn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\`Hp\Desktop\PROGRAM1\notificationSystem\notificationSystem\Database.accdb";
           OleDbCommand cmd = new OleDbCommand();
           cmd.Connection = cn;

           //reg();

           cn.Open();
           cmd.CommandText = "select article from news where npublished = '" + metroDateTime1.Text + "' AND ntime = '" + label4.Text + "'";
           //AND ntime = '" + label4.Text + "'

           //Scalar executes the fetching of data
           var a = cmd.ExecuteScalar();

           //this statement gets the process of getting the data from the database to label
           if (a != null)
           {
               label1.Text = "" + a.ToString();

               //while in this statement is displaying the data inside the textbox
               metroTextBox2.Text = label1.Text;
           }

           else if (metroTextBox2.Text != null)
           {

               //SEND SMS PROCESS
           }
           else if (metroTextBox2.Text == null)
           {
               //REPEAT FETCH
           }
           cn.Close();

So the code above works but i use a button, and i have to press the button everytime to fetch information. Does anyone have any advice on what should i do to automatically fetch information from database using datagridview and display it on textbox.

I want to put the code on form load, so everytime i will run the program it will automatically fetch and do its job. But i don't know how to do it and i tried but it won't work.

Any help is gradly appreciated.