Auto Sequencing in column list

Question

Hi,
I want to create a column with sequence.
My Scenario is
-India                            1
          01/02/1992         1.1
          02/04/2000          1.2
-America                      2
            05/08/2011      2.1
             02/02/2001      2.2

Answer 1

Hi,
You have to write event receiver to achieve this auto increment.
The following is the example code to increment the value by 1.  You can tweak the code the meet your requirements like condition based on country etc.
public override void ItemAdded(SPItemEventProperties properties)
SPWeb web = properties.OpenWeb();
bool allowUpdates = web.AllowUnsafeUpdates; //store original value
this.EventFiringEnabled = false;
try
web.AllowUnsafeUpdates = true;
/*get the current list*/
SPList list = web.Lists[properties.ListId];
var highestvalue = 0;
var objQuery = new SPQuery
Query ="<OrderBy><FieldRef Name='" + ColumnName
+"' Ascending='False' /></OrderBy><RowLimit>1</RowLimit>",
Folder = list.RootFolder
SPListItemCollection colItems = list.GetItems(objQuery);
if (colItems.Count > 0)
highestvalue = int.Parse(colItems[0][ColumnName].ToString());
var currItem = properties.ListItem;
currItem[ColumnName] = highestvalue + 1;
currItem.SystemUpdate(false);
catch (Exception ex)
Trace.WriteLine(ex.Message);
finally
this.EventFiringEnabled = true;
web.AllowUnsafeUpdates = allowUpdates; //restore original value
And also refer to the following article, if you are not going to use the event receiver.
Add a Unique Auto-Incrementing Column to a SharePoint List
Please mark it answered, if your problem resolved.