Why would var be a bad thing?

Question

I\'ve been chatting with my colleagues the other day and heard that their coding standard explicitly forbids them to use the var keyword in C#. They had no idea

Answer 1

Here are the results of a test I ran on efficiency of var versus explicit typing:

  private void btnVar_Click(object sender, EventArgs e)
    {
        Stopwatch obj = new Stopwatch();
        obj.Start();
        var test = "Test";
        test.GetType();
        obj.Stop();
        lblResults.Text = obj.Elapsed.ToString();
    }

    private void btnString_Click(object sender, EventArgs e)
    {
        Stopwatch obj = new Stopwatch();
        obj.Start();
        string test = "Test";
        obj.Stop();
        lblResults.Text = obj.Elapsed.ToString();

    }

First Label result is: 00:00:00 000034

Second Label result is: 00:00:00 00008