C#

Label[] labels = [ label1, label2, ..., label8 };  // Works with labels with more meaningful names as well

public class DisplayValue
    {
    public double Value { get; set; }
    public Label Label { get; set; }
    public override string ToString()
        {
        return Value < 1.0 ? (1000 * value).ToString("0.###") + " mV"
                           : Value.ToString("0.###") + " V";
        }
    }

foreach (DisplayValue dv in Values)
   {
   dv.Label.Text = dv.ToString();
   }

private static string FormatVoltage(double voltage)
{
   return (voltage < 1d)
      ? string.Format("{0:f3} mV", 1000 * voltage)
      : string.Format("{0:f3} V", voltage);
}

// Usage:
Label1.Text = FormatVoltage(value1);
Label2.Text = FormatVoltage(value2);
// etc...

public string foo { get { return condition ? A : doSomething(A); } }

value1 \t value2 \t ... value8 \n

private void Myport_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
in_data = serialPort.ReadLine(); //Reading one line from the serial port
this.Invoke(new Action(dataProcessing)); //start processing data
}

split = in_data.Split('\t'); 
//this is in the dataProcessing() method.

Quote:

In Visual Basic and Visual C#, you can use the Assert method from either Debug or Trace, which are in the System.Diagnostics namespace. Debug class methods are not included in a Release version of your program, so they do not increase the size or reduce the speed of your release code.

private void FrmMain_Shown(object sender, EventArgs e)
    {
    ...
    string[] dataWithCounts = dataFromTextBox.GroupBy(d => d).Select(g =>$"{g.Key}({g.Count()})").ToArray();
    Debug.Assert(dataWithCounts.Count() != 3);
    }

IL_008c: call class [mscorlib]System.Collections.Generic.IEnumerable`1<!!1> [System.Core]System.Linq.Enumerable::Select<class [System.Core]System.Linq.IGrouping`2<string, string>, string>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>, class [mscorlib]System.Func`2<!!0, !!1>)
IL_0091: call !!0[] [System.Core]System.Linq.Enumerable::ToArray<string>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>)
IL_0096: stloc.1
IL_0097: ldloc.1
IL_0098: call int32 [System.Core]System.Linq.Enumerable::Count<string>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>)
IL_009d: ldc.i4.3
IL_009e: ceq
IL_00a0: ldc.i4.0
IL_00a1: ceq
IL_00a3: call void [System]System.Diagnostics.Debug::Assert(bool)
IL_00a8: nop
IL_00a9: ret
} // end of method FrmMain::FrmMain_Shown

IL_0089: call class [mscorlib]System.Collections.Generic.IEnumerable`1<!!1> [System.Core]System.Linq.Enumerable::Select<class [System.Core]System.Linq.IGrouping`2<string, string>, string>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>, class [mscorlib]System.Func`2<!!0, !!1>)
IL_008e: call !!0[] [System.Core]System.Linq.Enumerable::ToArray<string>(class [mscorlib]System.Collections.Generic.IEnumerable`1<!!0>)
IL_0093: pop
IL_0094: ret