asp.ent下合并两个结构相同的DataTable

/// <summary> 
/// 合并两个相同的DataTable,返回合并后的结果 
/// </summary> 
/// <param name="dt1"></param> 
/// <param name="dt2"></param> 
/// <returns></returns> 
public DataTable CombineTheSameDatatable(DataTable dt1, DataTable dt2) 
{ 
if (dt1.Rows.Count == 0 && dt2.Rows.Count == 0) 
{ 
return new DataTable(); 
} 
if (dt1.Rows.Count == 0) 
{ 
return dt2; 
} 
if (dt2.Rows.Count == 0) 
{ 
return dt1; 
} 
DataSet ds = new DataSet(); 
ds.Tables.Add(dt1.Copy()); 
ds.Merge(dt2.Copy()); 
return ds.Tables[0]; 
}