Can anybody please tell me what user defined data type is in sql server and also how to create one.
And can i create a user defined datatype which resembles a .net datatable and pass this datatable as parameter to a stored procedure.
See this introductory article here: "What's the Point of [SQL Server] User-Defined Types?"
This answer on SO explains how to pass these UDT types to a stored procedure: Classic ADO.NET - How to Pass UDT To Stored Procedure?