How to change a pic??

i put like this
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)     Handles Button1.Click
      
     PictureBox1.Image = "1.JPEG"
        Label1.Text = "what text"

    End Sub

when i clck this button, the text "what text" will appear. but the picture stil can;t be display.
the error showed is " value of  type string cannot be converted to 'System.Drawing.Image'"

May i know what happen>