Partial Class in C# (ASP.net)

As I have earlier mentioned about Partial Class in our previous post. Here I am going to explain you how partial class works with in our live scenario. Here is the simple demonstration; I hope you will like it...

  Step 1: I am going to create partial Class (ClassA) with the class name ‘Calculation’, below is the code:

using System;

using System.Data;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

///

/// partial class using same name (Calculation)

///

///

//variable declaration in this partial class (ClassB)

public partial class Calculation

{

    public int Num1 = 0;

    public int Num2 = 0;

    public int Res = 0;

    public string Operator = null;

}

Step 2: I am going to create partial Class (ClassB) with the same class name ‘Calculation’, below is the code:

using System;

using System.Data;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

///

/// partial class using same name (Calculation)

///

///

public partial class Calculation

{

    //Function on this partial class (ClassB)

    public void Calculation()

    {

        switch (Operator)

        {

            case "+":

                Res = Num1 + Num2;

                break;

            case "-":

                Res = Num1 - Num2;

                break;

            case "*":

                Res = Num1 * Num2;

                break;

            case "/":

                Res = Num1 / Num2;

                break;

            case "%":

                Res = Num1 % Num2;

                break;

        }

    }

}

Step 3: Here is the code how we are going to use the Partial class in our application:

Here is the .aspx code:

<div>

    <asp:TextBox ID="txtNum1" runat="server">asp:TextBox>  <asp:TextBox ID="txtNum2" runat="server">asp:TextBox><asp:DropDownList ID="ddlOperator" runat="server">

    <asp:ListItem Value="+">Additionasp:ListItem>

    <asp:ListItem Value="-">Substractionasp:ListItem>

    <asp:ListItem Value="*">Multiplicationasp:ListItem>

    <asp:ListItem Value="/">Dividationasp:ListItem>

    <asp:ListItem Value="%">Modulusasp:ListItem>

    asp:DropDownList> 

    <asp:Button ID="btnAction" runat="server" Text="Action" onclick="btnAction_Click" />

    <asp:Label ID="lblDisplay" runat="server">asp:Label>

    div>

Here is the .aspx.cs code

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

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

{

    Calculation objEmp = new Calculation();     //Partial class initialization

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

        }

    }

    protected void btnAction_Click(object sender, EventArgs e)

    {

        objEmp.Num1 = Convert.ToInt32(txtNum1.Text);    //assign value (num1) to object classA

        objEmp.Num2 = Convert.ToInt32(txtNum2.Text);   //assign value (num2) to object classA

        objEmp.Operator = ddlOperator.SelectedValue;   //assign operator (function) to object classA

        objEmp.Calculation();                           //calculation in partial ClassB

        lblDisplay.Text = Convert.ToString(objEmp.Res); //Result from partial ClassA (Set value from ClassB) after calculation

    }

}

I hope now you are very much clear about partial classes.

Please feel free to comment / feedback to this post to make it more efficient in future. Thank you very much.