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String.IndexOf()

>All,
>
>I have a string and I need to find out at what position in the string a certain value exists. I need to do this in C#. For example:
>
>myString = '123456789Trade=xxxxxx'
>
>I want to interrogate the myString value and determine at what position does "Trade=" start. In this case I need to return the value 10 (or maybe 9 if the 1st position is the 0th position) as this would be the 10th (or 9th) position. I expect this constant value to exist in the string but will be in different positions in a file I am reading.
>
>Please advise as to what method or function I can use for this.
>
>Thanks in advance.