Some basic misapprehensions or faults which we come accross in .NET programming and their replacements.

# The most common error  is swallowing exceptions:

 

try
{
    //Something
}
catch
{
    //Do nothing.
} 

# Don't use "magic numbers" in your code.:

Ex:

if(mode ==3){...}
elseif(mode ==4){...}

Use Enumerations wherever possible, so the meaning, not the number, is exposed:

if(mode ==MyEnum.value1){...}
elseif(mode ==MyEnum.value2){...}

(Note:switch statements can be used here, as well) 

#  Performing large amount of string concatenation

 

Bad:

string s ="This ";
s +="is ";
s +="not ";
s +="the ";
s +="best ";
s +="way.";

Good:

StringBuilder sb =newStringBuilder();
sb.Append("This ");
sb.Append("is ");
sb.Append("much ");

sb.Append("better. ");

#  Checking a string variable if it is assigned. String object can be null so

Wrong!,

if(someStringVariable.length >0){
    //Do you always get this far?
}

Correct,

if(!String.IsNullOrEmpty(someStringVariable)){
    //Yeah! This one is better!
}

#   Using 'USING' statement
 

Don't unnecessarily nest using statements do this instead:

 using(SQLconnection conn =newSQLConnection())
 using(SQLCommand cmd =newSQLCommand("select 1", conn))// no need to nest
 {
    conn.open()
    using(SqlDatareader dr = cmd.ExecuteReader())//nessesary nest
    {
      //dr.read()
    }     
 }

#   Unnecessary use oftry and catch
 

try
{
  int result =int.Parse(Request.QueryString["pageid"]);
}
catch
{...

Instead of using

int result;
if(!int.TryParse(Request.QueryString["pageid"],out result))
{
    thrownewArgumentException.... 
}

Hope U found it Healthy.

Stay Knollecting!!