ASP.NET 向SQLSERVER中批量插入数据

using System.Data; 
 using System.Diagnostics; 
 using System.Data.SqlClient; 
 　　　 
 string connectionString = "Data Source=HG-J3EJJ9LSW5PY;Initial Catalog=Test;User ID=sa;password=hg"; 
 DataTable dataTable = sql_.select_datagrid(" select a from large where 1=0 ").Tables[0]; 
 string passportKey; 
 for (int i = 0; i < 100000; i++) 
 { 
 passportKey = Guid.NewGuid().ToString(); 
 DataRow dataRow = dataTable.NewRow(); 
 dataRow[0] = passportKey; 
 dataTable.Rows.Add(dataRow); 
 } 
 SqlConnection sqlConnection = new SqlConnection(connectionString); 
 sqlConnection.Open(); 
 SqlTransaction sqltran = sqlConnection.BeginTransaction(); 
 SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.KeepIdentity, sqltran); 
 sqlBulkCopy.DestinationTableName = "large"; 
 sqlBulkCopy.BatchSize = dataTable.Rows.Count; 
 if (dataTable != null && dataTable.Rows.Count != 0) 
 { 
 sqlBulkCopy.WriteToServer(dataTable); 
 } 
 sqlBulkCopy.Close(); 
 sqltran.Rollback(); 
 sqlConnection.Close();