C# :: Using Foreach Loop To Select A Name In Queue

I know that where I have the intIndex++ line is wrong. It's just going to stop at the last index and call it good, but I don't know how to make it stop at the matching name. The only examples I can ever seem to find use the foreach loop to print out a value, and I'm clearly just not understanding this enough to make it work for me.

Instructions are:
--Declare a variable to store the result of the search, int intIndex;
--Use an if statement with the Contains method to check if the name in the search box is in the queue.
--If Contains is true, initialize intIndex to zero and use a foreach to walk through queue, else display a message that the name is not in the list.
--If a match is found use intIndex to select the matching entry in listbox and display a message indicating the name was found. Be sure to increment intIndex each time through the loop.

private void btnSearchByName_Click(object sender, EventArgs e) {
//delcare int variable to use as the index for the list box
int intIndex;
//If Contains is true
if (cstrName.Contains(txtSearchName.Text))

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