Introduction
Today, in this article let's play around with one of the interesting and most useful concepts in SharePoint 2010.
Question: What is a calculated field?
In simple terms "You can have any type of numeric calculations for any field in a list or to perform any string data manipulations".
Step 1: Open SharePoint 2010 Central Administration and navigate to a specific site.
Step 2: Open up Visual Studio 2012 and try to create a "SharePoint Visual Web Part" project, as in:
![open-sharepoint2010-visual-webpart.jpg]()
Step 3: Select "Deploy as a farm solution" as in the following and click the "Finish" button.
![sharepoint-customization-wizard.jpg]()
Step 4: The complete code of visualwebpart1usercontrol.ascx looks like this:
<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls"
Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register TagPrefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<%@ Register TagPrefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages"
Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="VisualWebPart1.ascx.cs"
Inherits="CalculatedFieldProgramaticallyApp.VisualWebPart1.VisualWebPart1" %>
<div style="text-align: center;">
<table>
<tr>
<td colspan="2">
<asp:label id="Label1" runat="server" text="Calculated Column in SharePoint 2010 using VS 2012"
font-bold="true" font-size="Large" font-names="Verdana" forecolor="Maroon"></asp:label>
</td>
</tr>
<tr>
<td>
<asp:label id="Label2" runat="server" text="Please Enter List Name" font-size="Large"
font-names="Verdana" font-italic="true"></asp:label>
</td>
<td>
<asp:textbox id="TextBox1" runat="server"></asp:textbox>
</td>
</tr>
<tr>
<td>
<asp:label id="Label3" runat="server" text="Please Enter Calculated Field Name" font-size="Large"
font-names="Verdana" font-italic="true"></asp:label>
</td>
<td>
<asp:textbox id="TextBox2" runat="server"></asp:textbox>
</td>
</tr>
<tr>
<td>
<asp:label id="Label4" runat="server" text="Please Enter Calculated Field Formula"
font-size="Large" font-names="Verdana" font-italic="true"></asp:label>
</td>
<td>
<asp:textbox id="TextBox3" runat="server"></asp:textbox>
</td>
</tr>
<tr>
<td colspan="2">
<asp:button id="Button2" runat="server" text="Create List Fields" font-names="Verdana"
width="166px" backcolor="Orange" font-bold="True" onclick="Button2_Click" />
</td>
</tr>
<tr>
<td colspan="2">
<asp:label id="Label5" runat="server" font-bold="true" font-names="Verdana" forecolor="Maroon"></asp:label>
</td>
</tr>
</table>
</div>
Step 5: The complete code of visualwebpart1usercontrol.ascx.cs looks like this:
using Microsoft.SharePoint;
using System;
using System.ComponentModel;
using System.Web.UI.WebControls.WebParts;namespace CalculatedFieldProgramaticallyApp.VisualWebPart1
{
[ToolboxItemAttribute(false)]
public partial class VisualWebPart1 : WebPart
{
// Uncomment the following SecurityPermission attribute only when doing Performance Profiling using
// the Instrumentation method, and then remove the SecurityPermission attribute when the code is ready
// for production. Because the SecurityPermission attribute bypasses the security check for callers of
// your constructor, it's not recommended for production purposes.
// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Assert, UnmanagedCode = true)]
public VisualWebPart1()
{
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
InitializeControl();
}
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Focus();
}
protected void Button2_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))
{
Label5.Text = "Please Enter Some Values";
Label5.ForeColor = System.Drawing.Color.Red;
}
else
{
SPWeb web = SPContext.Current.Web;
SPList list = web.Lists[TextBox1.Text];
SPFieldCalculated calc = (SPFieldCalculated)list.Fields.GetFieldByInternalName(list.Fields.Add(TextBox2.Text, SPFieldType.Calculated, true));
calc.Formula = TextBox3.Text;calc.Currency = SPCurrencyFieldFormats.UnitedStates;calc.Update();
SPView view = list.DefaultView;
view.ViewFields.Add(TextBox2.Text);
view.Update();
Label5.Text = TextBox2.Text + " - Field Successfully Created";
Label5.ForeColor = System.Drawing.Color.Green;
TextBox1.Text = string.Empty;
TextBox2.Text = string.Empty;
TextBox3.Text = string.Empty;
}
}
}
}
Step 6: Deploy the solution file and add the new webpart to a SharePoint site.
Step 7: The output of the application looks like this:
![calculated-column-in-sharepoint2010.jpg]()
Step 8: Entering calculated field data output of the application looks like this:
![app-calculated-column-in-sharepoint2010.jpg]()
Step 9: Item adding to the list output of the application looks like this:
![Item-adding-to-the-list-sharepoint2010.jpg]()
Step 10: Item added to the list output of the application looks like this:
![Item-added-to-the-list-sharepoint2010.jpg]()
I hope this article is useful for you.