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If you have a string, with some value in it, and you want to pad it out to a certain length, with another character you should check out the PadRight and PadLeft primitives of the String class.

The Functions take two parameters: totalWidth and paddingChar. Here are some examples:

Dim OurString As String = "thisistext"
Console.WriteLine(OurString.PadRight(15, "_")

' Result: "thisistext_____"

Dim OurInteger As Integer = 99
Console.WriteLine(OurInteger.ToString.PadLeft(10, "0")

' Result: "0000000099"