if your project is in vb.net then use this code else if C# then convert this code to C#
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
gvTotalNames.Rows.Add()
gvTotalNames.Item(0, gvTotalNames.Rows.Count - 1).Value = txtName.Text
txtName.Text = ""
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
gvTotalNames.AllowUserToAddRows = False
gvTotalNames.Rows.Clear()
End Sub