ListBox.FindString Method (String)
Finds the first item in the ListBox that starts with the specified string.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The value of the s parameter is less than -1 or greater than or equal to the item count.
The search performed by this method is not case-sensitive. The search looks for words that partially match the specified search string parameter, s. You can use this method to search for the first item that matches the specified string. You can then perform tasks such as removing the item that contains the search text by using the Remove method or changing the item's text. Once you have found the specified text, if you want to search for other instances of the text in the ListBox, you can use the version of the FindString method that provides a parameter for specifying a starting index within the ListBox. If you want to perform a search for an exact word match instead of a partial match, use the FindStringExact method.
The following code example demonstrates how to use the FindString method to search for the first instance of a string in a ListBox. If no items are found that match the search string FindString returns a -1 value and the example displays a MessageBox. If an item is found that matches the search text, the example uses the SetSelected method to select the item in the ListBox.