How To Pass A DataTable To A Stored Procedure Using C# and SQL Server

TODO:

Have you ever wanted to pass a DataTable from your C# application to a Stored Procedure in SQL Server?

SOLUTION:

Step 1:  Create the User-Definied Table Type in SQL Server

CREATE TYPE [dbo].[MyUserDefinedType] AS TABLE(
	[Id] [int] NULL,
	[FieldOne] [int] NULL,
	[FieldTwo] [int] NULL
)

Step 2:  Create the DataTable and call the Stored Procedure

using (DataTable myDataTable = new DataTable())
{
     myDataTable.Columns.Add(“FieldOne”, System.Type.GetType("System.Int32"));
     myDataTable.Columns.Add(“FieldTwo, System.Type.GetType("System.Int32"));
     myDataTable.Columns.Add(“FieldThree, System.Type.GetType("System.Int32"));
                
     DataRow dataRow = null;
                
     for (int i = 0; i < 100; i++)
     {
          dataRow = myDataTable.NewRow();  
          dataRow[“FieldOne] = 1;
          dataRow[“FieldTwo”] = 2;
          dataRow[“FieldThree] = 3;
          myDataTable.Rows.Add(dataRow);           
     }

     using (SqlConnection connection = new SqlConnection(“connectionstring”))
     {
          
          using (SqlCommand command = connection.CreateCommand())
          {
               connection.Open();
               command.CommandType = CommandType.StoredProcedure;
               command.CommandTimeout = 90;
               command.CommandText = “MyStoredProcedureName;
               command.Parameters.AddWithValue(“@IncomingDataTable”, myDataTable);
               command.ExecuteNonQuery();
          }
     }
}

Step 3:  Create the Table

CREATE TABLE MyTable(FieldOne int NULL, FieldTwo NULL, FieldThree NULL)

Step 4:  Create the Stored Procedure

CREATE PROCEDURE [dbo].[MyStoredProcedure]
@MyUserDefinedType MyUserDefinedType READONLY

AS
BEGIN 

    INSERT INTO dbo.MyTable
	([FieldOne], [FieldTwo], [FieldThree])
	
	SELECT [FieldOne], [FieldTwo], [FieldThree] FROM @MyUserDefinedType

END

NOTES:

Be sure that the DataTable columns are added in the SAME order as they are created in the SQL Server User Type.