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How can I create a new SharePoint group by code?

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SPWeb root = site.RootWeb;
SPGroup group = null;

// Check if the group exists
try
{                                     
    group = root.SiteGroups["The Group Name"];
}
catch { }

// If it doesn't, add it
if (group == null)
{
    root.SiteGroups.Add("The Group Name", member, root.Author, "Your Group Description");
    group = root.SiteGroups["The Group Name"];

    // Add the group's permissions
    SPRoleDefinition roleDefinition = root.RoleDefinitions.GetByType(SPRoleType.Contributor);
    SPRoleAssignment roleAssignment = new SPRoleAssignment(group);
    roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
    root.RoleAssignments.Add(roleAssignment);
    root.Update();
}
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Is there compulsory to update the root (root.update()) in the end ? – Dipen Shah Dec 30 '15 at 9:58
    
@DipenShah Try it without and see if it persists :) – RJ Cuthbertson Dec 30 '15 at 21:34

Creating the group is simple just call SPGroupCollection.Add

using (SPWeb oWebsiteRoot = SPContext.Current.Site.RootWeb)
{
    SPGroupCollection collGroups = oWebsiteRoot.SiteGroups;
    SPUser oUser = oWebsiteRoot.Users["User_Name"];
    SPMember oMember = oWebsiteRoot.Users["User_Name"];

    collGroups.Add("Group_Name", oMember, oUser, "Description");
}

Then you need may need to add users/groups and permissions depending on your needs

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6  
The code for creating the group is perfect. But I don't think you should dispose the RootWeb object created from SPContext.Current.Site. Details here: msdn.microsoft.com/en-us/library/office/… – Vardhaman Deshpande May 16 '14 at 15:20
    
RJ Cuthbertson's answer is closer to how I'd want things to work - after creating a group you also want to associate it to a site, and this is done by using the SPRoleDefinition/SPRoleAssignment combo. – Vlad May 10 '15 at 11:47
web.SiteGroups.Add(groupName, web.SiteAdministrators[0], web.SiteAdministrators[0], "");
SPGroup group = web.SiteGroups[groupName];
// Add the group's permissions
SPRoleDefinition roleDefinition = web.RoleDefinitions.GetByType(SPRoleType.Administrator);//Add Role Type as Administrator(Full Control),Contributor and Editor etc.
SPRoleAssignment roleAssignment = new SPRoleAssignment(group);
roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
web.RoleAssignments.Add(roleAssignment);
web.Update();

Follow the link below for complete code Create SharePoint Group and Group Permission Programmatically

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