Tooltip with GUI.TextField

Questions & Answers
1 
    var stringToEdit : String = "Hello World";
    function OnGUI () 
    {
    stringToEdit = GUI.TextField (Rect (10, 10, 200, 20),stringToEdit,GUIContent ("start1"));

    if(GUI.tooltip == "start1")
    {
    GUI.Label (Rect (130,835,300,40), "enter in text field");
    }
    }

BCE0023: No appropriate version of 'UnityEngine.GUI.TextField' for the argument list '(UnityEngine.Rect, String, UnityEngine.GUIContent)' was found.

when i am trying to use tool tip text field

3 
var stringToEdit : String = "";

function OnGUI() 
{
    stringToEdit = GUI.TextField(Rect(10, 10, 200, 20), stringToEdit, 25);
    GUI.Label(Rect(10, 10, 300, 50), GUIContent(" ", "label1"));

    if (GUI.tooltip == "label1")
    {
       GUI.Label(Rect(210, 30, 300, 40), "enter in text field");
    }
}
2

Check the reference on GUI.TextField. None of the parameters are of type GUIContent, yet you try to supply one.

Error happens here:

stringToEdit = GUI.TextField(…, …, GUIContent(“start1”));

I guess you need to set the tooltip manually if the mouse is over the rect.