C # DataSet.Designer.cs

Today, when I was doing the project, I found a very wonderful problem, VS. DataSet DataSet problem
DataSet DataSet Update, after saving the original Dataset.Designer.cs unchanged, and add a new Dataset1.Designer.cs file
What's going on?
There is a good solution to see online today:
0. Remove the Dataset1.Designer.cs and Dataset.Designer.cs from the project first
1. Close the solution
2. Go to the "project file" where the dataset is located and the file ending with ". csproj"
3. Open in text mode
4. Find (using ctrl+f) <LastGenOutPut>Dataset1.Designer.cs</LastGenOutput>
5. Change to <LastGenOutPut>Dataset.Designer.cs</LastGenOutput>
6. Open the solution again.
7. Right-click on the dataset and click on the file that runs the custom tool to redesign.

C # DataSet.Designer.cs