Remove Group Permission to ListItem in SharePoint 2010 Programmatically Using VS 2012

<asp:label id="Label3" runat="server" text="Please Enter Group Name:"></asp:label>

</td>

<td>

<asp:textbox id="TextBox2" runat="server"></asp:textbox>

</td>

</tr>

<tr>

<td colspan="2">

<asp:button id="Button1" runat="server" text="Remove Permission to Item" forecolor="Orange"

font-bold="true" backcolor="Black" onclick="Button1_Click" width="245px" style="height: 26px" />

</td>

</tr>

<tr>

<td colspan="2">

<asp:label id="Label4" runat="server" font-bold="true"></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 RemoveListItemPermissionApp.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 Button1_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text)|| string.IsNullOrEmpty(TextBox3.Text))

{

Label4.Text = "Please Enter Some Values";

Label4.ForeColor = System.Drawing.Color.Red;

}

else{SPWeb web = SPContext.Current.Web;

SPGroup group = web.SiteGroups[TextBox2.Text];

SPPrincipal principal = (SPPrincipal)group;SPRoleAssignment rAssignment = new SPRoleAssignment(group);

SPList list = web.Lists[TextBox1.Text];

SPListItem item = list.Items.GetItemById(int.Parse(TextBox3.Text));

item.BreakRoleInheritance(true);

item.RoleAssignments.Remove(principal);item.Update();

Label4.Text = "Permission is removed on item";

Label4.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:

Step 8: Group showing previously output of the application looks like this:

Step 9: Data Entering output of the application looks like this:

Step 10: Group deleted for listitem output of the application looks like this:

I hope this article is useful for you.