Ok try this
Protected Sub lvefrom_TextChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles lvefrom.TextChanged
Dim ObjLocDate As New Date
Dim IntLocDays As Integer
IntLocDays = Convert.ToInt32(lve.Text)
ObjLocDate = lvefrom.Text
ObjLocDate = ObjLocDate.AddDays(IntLocDays)
lveto.Text = ObjLocDate.Date.ToString("MM/dd/yyyy")
End Sub