Question : bulkCopy.WriteToServer(<Da<wbr />taTable>) problem

HI Guys
I am trying to do a bulk insrert using the System.Data.SqlClient BulkCopy class
Bulk Copy is done against a BL_CHAT table created by
----start-----
CREATE TABLE [dbo].[BL_CHAT](
      [COMMUNITY_ID] Bigint NOT NULL,
      [MSG_ID] Bigint  IDENTITY(1,1) NOT NULL,
      [SENT_AT] DateTime NULL DEFAULT (getdate()),
      [SENDER] Bigint  NOT NULL,
      [CHAT_MSG] nvarchar(max) NOT NULL,
PRIMARY KEY NONCLUSTERED
(
      [COMMUNITY_ID] ASC,
      [MSG_ID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
----end-----
Datatable is initialized by :
           dataTable = new DataTable(ChatConstants.CHAT_TABLE);          
            // initialize data table
            DataColumn communityId = new DataColumn (ChatConstants.ChatTable.COMMUNITY_ID);
            DataColumn sentAt = new DataColumn (ChatConstants.ChatTable.SENT_AT);
            DataColumn sender = new DataColumn (ChatConstants.ChatTable.SENDER);
            DataColumn message = new DataColumn (ChatConstants.ChatTable.CHAT_MSG);
            dataTable.Columns.Add(communityId);
            dataTable.Columns.Add(sentAt);
            dataTable.Columns.Add(sender);
            dataTable.Columns.Add(message);

where constants are :

        public static string CHAT_TABLE = "BL_CHAT";
        public class ChatTable
        {
            // Chat table columns
            public static string COMMUNITY_ID = "COMMUNITY_ID";
            public static string SENT_AT = "SENT_AT";
            public static string SENDER = "SENDER";
            public static string CHAT_MSG = "CHAT_MSG";

        }

Now, when I am calling bulkCopy.WriteToServer on that DataTable , I have got the following error :
---error strat---
The given value of type String from the data source cannot be converted to type
datetime of the specified target column.
---error end---

It seems that the fact that I am not mapping all the columns ( since the MSG_ID is IDENTITY column), something is getting wrong and the CHAT_MSG value is mapped to the SENT_AT

Is there a way to map explicitly DataTable columns to DB columns ???
Any suggestions ???

Answer : bulkCopy.WriteToServer(<Da<wbr />taTable>) problem

Try using column mappings as defined in this example:

SqlBulkCopy BCP = new SqlBulkCopy(conTarget);
BCP.DestinationTableName = "CustomersShort";
BCP.ColumnMappings.Add("CustomerID", "ID");
BCP.ColumnMappings.Add("CompanyName", "Company");
BCP.ColumnMappings.Add("ContactName", "Contact");

Bob