How to Interpret pseudocode in c#?

So you need a parser for a DSL.

I can advise you ANTLR, which will let you build a grammar easily.

Here's a totally untested simple grammar for it:

grammar ConfigFile;

file: object+;
object: ID '{' property+ '}';
property: ID ':' value ';';
value: (ID|CHAR)+;

ID: [a-zA-Z][a-zA-Z0-9_]*;
WS: [ \t\r\n]+ -> channel(HIDDEN);
CHAR: .;

Alternate solution: You also could use regex:

(?<id>\w+)\s*\{\s*(?:(?<prop>\w+)\s*:\s*(?<value>.+?)\s*;\s*)*\}

Then extract the captured information. For each match, you'll have a group id with the name of the object. The groups prop and value will have multiple captures, each pair defining a property.

In C#:

var text = @"
AGEYEARS {
    Description: Age in Years;
    Type: Range;
    MinVal: 0;
    MaxVal: 124;
    Default: 0;
    ErrorAction: ERT1:=04 GRT4:=960Z; 
}

OTHER {
    Foo: Bar;
    Bar: Baz;
}";


var re = new Regex(@"(?<id>\w+)\s*\{\s*(?:(?<prop>\w+)\s*:\s*(?<value>.+?)\s*;\s*)*\}");

foreach (Match match in re.Matches(text))
{
    Console.WriteLine("Object {0}:", match.Groups["id"].Value);

    var properties = match.Groups["prop"].Captures.Cast<Capture>();
    var values = match.Groups["value"].Captures.Cast<Capture>();

    foreach (var property in properties.Zip(values, (prop, value) => new {name = prop.Value, value = value.Value}))
    {
        Console.WriteLine("    {0} = {1}", property.name, property.value);
    }

    Console.WriteLine();
}

This solution is not as "pretty" as the parser one, but works without any external lib.