Converting string expression to Integer Value using C# [duplicate]

Sorry if this question is answered already, but I didn't find a suitable answer. I am having a string expression in C# which I need to convert to an int or decimal value.

For example:

string strExp = "10+20+30";

the output should be 60.

how shall I do that???

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Fwiw, there is an expression parser built into the .NET framework. The DataTable.Compute() method uses it:

using System;
using System.Data;

class Program {
    static void Main(string[] args) {
        var expr = "10 + 20 + 30";
        var result = new DataTable().Compute(expr, null);
        Console.WriteLine(result);
        Console.ReadLine();
    }
}

Beware however that it isn't a very full-featured one. Simple expressions only, the kind you'd find in a SQL query.

There is nothing built into .NET, so you will need to use a mathematical expression parser and use that to get the result.

Here is one. And a couple of articles.