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LOG4J's LOG rating (LEVEL) contains five kinds of five levels of high and low order FATAL > ERROR > WARN > INFO > DEBUG log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p #1.Only SHOW ERROR===================================================================================================== log4j.RollingFileAppender log4j.appender.Err.Append=true log4j.appender.Err.MaxFileSize=100MB log4j.appender.Err.MaxBackupIndex=30 log4j.appender.Err.layout=org.apache.log4j.PatternLayout #3.SHOW I NFO+ERROR===================== log4j.appender.MixLog=org.apache.log4j.RollingFileAppender log4j.appender.MixLog.Append=true log4j.appender. MixLog.MaxFileSize=100MB log4j.appender.MixLog.MaxBackupIndex=30 log4j.appender.MixLog.layout=org.apache.log4j.PatternLayout DataTable dt = new DataTable(); dt.Columns.Add(ID); dt.Rows. Add(DR1); dt.Rows.Add(DR2); var foundRow = dt.Rows.Find(findTheseVals); dt.DefaultView.Sort = ID, DATE Asc; int index = dt.DefaultView.Find(ss); ref The difference between out and out In C#, parameters can be pas*ed either by value or by reference. Pas*ing a parameter by reference allows the function member to change the value of the parameter and keep the change. To pas* parameters by reference, you can use the ref or out keyword. Both the ref and out keywords provide similar power, and they act much like pointer variables in C. The differences are: 1. When using ref type parameters, the parameters pas*ed in must be initialized first. For out, it must be initialized in the method. Note: In C#, there are four types of method parameter pas*ing: (1) pas* value (by value) public void FunctionByReferance( ref string Value) { If the value pas*ed parameter changes the value of the parameter during the method call, then pas* The parameters of the incoming method do not change after the method call is completed, but retain the value that was originally pas*ed in.