I don't like to hard code strings into code if I can avoid it for internationlization reasons and for ease of editing at one place.  So I put all my messages in a resource file.   To display "Page # of #", I create a string resource named "PageNumberOfTotal" and its content is "Page {0} of {1}".  Then I handle the DataBound event of the GridView control as follows:
        protected void gdRecords_DataBound(object sender, EventArgs e)
        {
  //If there are records to display, then display the message
            if (gdRecords.Rows.Count > 0)
            {
                lblNumberOfRecords.Visible = true;
                lblNumberOfRecords.Text = string.Format(
                   MessageResource.Properties.Resources.PageNumberOfTotal,
                    gdRecords.PageIndex + 1,
                    gdRecords.PageCount);
            } //If there isn't any records to display, the hide the label control
            else lblNumberOfRecords.Visible = false;
        }
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