Parse file for one value then return to top

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C#

I am parsing a file for various fields using the following code

using (StreamReader sr = new StreamReader("TestFile.txt"))
{
    string line = sr.ReadLine();
    int startIndex, endIndex = -1;

    while (line != null)
    {
        if (line.IndexOf("value") > -1)
        {
            startIndex = line.IndexOf("value") + 5;

............
............

Instead of parsing for all the fields I need I would like to parse for one specific value, if that value exists and its normally somewhere at the end of the file I would then like to return to the top of the file and parse for the rest of the values. Otherwise I don't want to waste my time parsing for all the values if this one value does not exist.

My problem is how do I return to the top of the file and start parsing all over again if my found value is there?


Thanks