您应该使用sqlParameter。http://msdn.microsoft.com/zh- CN/library/yy6y35y8.aspx
string query = "insert into ACTIVE.dbo.Workspaces_WsToRefile values(@folderID, @newWorkSpace, @createDate)";
using(sqlCommand cmd = new sqlCommand(query, sqlConnection))
{
sqlParameter param = new sqlParameter("@folderID", folderId);
param.sqlDbType = sqlDbType.Int;
cmd.Parameters.Add(param);
.....
}