Web Part Application in SharePoint 2010

<asp:Button ID="Button3" runat="server" Text="Multiplication" Width="165px"Font-Names="Verdana" BackColor="Orange" onclick="Button3_Click" />

</td>

</tr>

<tr>

<td></td>

<td>

<asp:Button ID="Button4" runat="server" Text="Division" Width="165px"Font-Names="Verdana" BackColor="Orange" onclick="Button4_Click" />

</td>

</tr>

</table>

<br />

<br />

<table>

<tr>

<td colspan="2">

<asp:Label ID="lblResult" runat="server" Font-Names="Verdana" ForeColor="Brown"></asp:Label>

</td>

</tr>

</table>

</center>

</div>

Step 4: The complete code of IArthmetic.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SharePointWebpartProject

{

public interface IArthmetic

{

double Add(double a, double b); double Sub(double a, double b); double Mul(double a, double b); double Div(double a, double b);

}

}

Step 5: The complete code of Arthmetic.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SharePointWebpartProject

{

public class Arthmetic : IArthmetic

{

public double Add(double a, double b)

{

return a + b;

}

public double Sub(double a, double b)

{

return a - b;

}

public double Mul(double a, double b)

{

return a * b;

}

public double Div(double a, double b)

{

return a / b;

}

}

}

Step 6: The complete code of visualwebpart1.ascx.cs looks like this:

using System;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;namespace SharePointWebpartProject.VisualWebPart1

{

public partial class VisualWebPart1UserControl : UserControl

{

protected void Page_Load(object sender, EventArgs e)

{

TextBox1.Focus();

}

protected void Button1_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

{

lblResult.Text = "Please Enter Some Values";

}

else

{

lblResult.Text = "Addition Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + objArthmetic.Add(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString() + "</b>";TextBox1.Text = "";TextBox2.Text = "";}}protected void Button2_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

{

lblResult.Text = "Please Enter Some Values";

}

else

{

lblResult.Text = "Subtraction Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + objArthmetic.Sub(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString() + "</b>";TextBox1.Text = "";TextBox2.Text = "";

}

}

protected void Button3_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

{

lblResult.Text = "Please Enter Some Values";

}

else

{

lblResult.Text = "Multiplication Result of " + TextBox1.Text + " and " + TextBox2.Text + " is: <b>" + objArthmetic.Mul(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString() + "</b>";TextBox1.Text = "";TextBox2.Text = "";

}

}

protected void Button4_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

{

lblResult.Text = "Please Enter Some Values";

}

else

{

lblResult.Text = "Division Result of "+TextBox1.Text+" and "+TextBox2.Text+" is: <b>"+objArthmetic.Div(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text)).ToString()+"</b>";TextBox1.Text = "";TextBox2.Text = "";

}

}

#region Instance VariablesArthmetic objArthmetic = new Arthmetic();#endregion

}

}

Step 7: Now build and deploy the solution. The output of the application looks like this:

Step 8: The Nothing entered application looks like this:

Step 9: The Addition operation application looks like this:

I hope this article is useful for you. I look forward for your comments and feedback.