Exception meaning in .net core

//Using the snippet shown above, the error page will show the offending line in red, with a variable number of lines of code above it. The number of lines is determined by the value of SourceCodeLineCount, which is set to 2 in this case. 


var options = new DeveloperExceptionPageOptions
{
   SourceCodeLineCount = 2
};  
app.UseDeveloperExceptionPage(options);

Source: wakeupandcode.com

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