You probably need some thing like
public void BatchBulkCopy(DataTable dataTable, string DestinationTbl, int batchSize)
{
// Get the DataTable
DataTable dtInsertRows = dataTable;
using (SqlBulkCopy sbc = new SqlBulkCopy(connectionString, SqlBulkCopyOptions.KeepIdentity))
{
sbc.DestinationTableName = DestinationTbl;
// Number of records to be processed in one go
sbc.BatchSize = batchSize;
// Add your column mappings here
sbc.ColumnMappings.Add("field1","field3");
sbc.ColumnMappings.Add("foo","bar");
// Finally write to server
sbc.WriteToServer(dtInsertRows);
}
}
Ref: How to use SqlBulkCopyColumnMappingCollection?
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Seel also http://www.codeproject.com/Articles/18418/Transferring-Data-Using-SqlBulkCopy