how to calculate AREA OF A CIRCLE in asp.net | sradha webcreations

AREA OF A CIRCLE

            ENTER RADIUS OF A CIRCLE

            THE AREA OF CIRCLE IS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Web.Security;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void ButtonCALCULATE_Click(object sender, EventArgs e)

    {

        float fRadius;

        float fArea;

        fRadius = Convert.ToInt32(TXTRADIUS.Text);

        fArea = (3*(fRadius*fRadius));

        TXTAREA.Text = Convert.ToString(fArea);

    }

    protected void ButtonSAVE_Click(object sender, EventArgs e)

    {

  string connectionString = ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString;

string insertSql = "INSERT INTO circle(radious,area) VALUES(@radious,@area)";

        using (SqlConnection myConnection = new SqlConnection(connectionString))

        {

            myConnection.Open();

  SqlCommand myCommand = new SqlCommand(insertSql, myConnection);

  myCommand.Parameters.AddWithValue("@radious", TXTRADIUS.Text);

  myCommand.Parameters.AddWithValue("@area", TXTAREA.Text);

            myCommand.ExecuteNonQuery();

            myConnection.Close();

        }

        // "Reset" the Subject and Body TextBoxes

        TXTRADIUS.Text = string.Empty;

        TXTAREA.Text = string.Empty;

        

    }

}