Show ASP.Net Button when no error found in C#

indradeo says:

        protected void calculate_Click(object sender, EventArgs e)

        {

            String Label = "Label20.Text";

 

            if (Label == "No_Error")

            {

 

                Button1.Visible = true;

 

            }

            calcualtion();

            calcualtion1();

            calcualtion2();

            calcualtion3();

            //error();

            

        }

Replace above code with below code. 

protected void calculate_Click(object sender, EventArgs e)
{
    string Label = Label20.Text;

    if (Label == "No_Error")
    {
        Button1.Visible = true;
    }
    calcualtion();
    calcualtion1();
    calcualtion2();
    calcualtion3();
    //error();
}