how to make an additional column to a list?

Question

I made a custom list on task.

I want to add a column to the list with VS.

How to do that?

Answer 1

If list is created using custom listdefintion template "Tasks" then you can directly  add Field tag in schema.Which will create field to the list.

If you have created list from UI, then you can write code to create field to it. 

Options to create field would by creating console application, powershell script or binding code in feature receiver.

Check code to create field in below articles

    http://allaboutmoss.com/2011/02/04/creating-sharepoint-list-and-add-column-programmatically/

   http://blogs.msdn.com/b/syedi/archive/2009/12/04/programmatically-creating-a-field-column-from-the-custom-field-type-in-wss-3-0-moss.aspx

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Regards,

Milan Chauhan

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Answer 2

Use the SPFieldCollection.Add Method

using (SPSite site = new SPSite("your_site_url"))
{
 using (SPWeb web = site.OpenWeb())
    {
 try
    {
  SPList list = web.Lists["your_custom_list"];
  list.Fields.Add("FieldName",SPFieldType.Text,false);
  list.Update();
    }
    catch (Exception ex)
 {
        string message = ex.Message;
    }
}

If the field is requierd to contain a value ,change the last param to true

http://msdn.microsoft.com/en-us/library/ms472869.aspx

Regards

Bjoern

Answer 3

I want to know how to modify schema.xml file.

Answer 4

In short,  you have to edit the <Fields> and <ViewFields> elements .

The following links should be useful:

http://msdn.microsoft.com/en-us/library/ms459356.aspx

http://msdn.microsoft.com/en-us/library/ff728096.aspx

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Regards Bjoern