Considerations (Real-time update)

1 . Try {} Catch {} Statements
In try {} Catch {} Catch {} Do not use response. Redirect ();
Response. Write ( " <SCRIPT> alert ('error! ') </SCRIPT> " ); Statement, or use
Try (Exception E)
{
Response. Write ("<SCRIPT> alert ('"+Ex. Message+"') </SCRIPT>"
}

2 . Static
  Private   Static   Int I = 0 ;
Private   Int I = 0 '
If there is static, the operation results will be retained. Computation results are not retained without static.

3 . Notes for rangevalidator:
If the type in the attribute is set to string type, the value of maximumvalue and minimumvalue can only be set to a single letter, not a number, and the two values are not set to letters, the two locations are only the first letter. When running, you only need to check whether the first letter in the text box is within the range, regardless of the letter or number.

4 . Difference Between sqldatareader and sqldataadapter:
Sqldatareader is suitable for reading data from a single row and displaying data from one row with multiple controls. Sqldatareader is a form of reading data streams and may lose the first row of data.

Sqldataadapter copies the entire table. Data will not be lost.
5 . Adapter can take cells, and the entire table
Reader retrieves a row

6 . Close the window
This . Btnclose. Attributes. Add ( " Onclick " , " Window. Close () " );

7 . To bind a datalist, remember to add ( ! Ispostback)

8 . When setting properties, use public.

9 . Change the file name. Change the class name.

10 . It is best not to use Chinese characters for transferring values between pages, which is prone to errors.