C# - Enable Disable Button On The Basis Of Grid Row?

I have a grid control where i am binding list of stickers. On the above of grid , that is out side grid i have two buttons Create Sticker and Void Sticker. Sticker basically have three properties Active , Void and Expired displayed as text in column. There is condition of adding only one sticker at a time. Also if there is an active sticker then user cannot add another sticker until and unless its is expired or void.

So what i want is that whenever my grid is loaded if there is an column with text active the the create / add sticker will get disabled and void will get enabled. I am using the folloing code

/// <summary>
/// Handles the RowDataBound event of the gvSticker control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Web.UI.WebControls.GridViewRowEventArgs"/> instance containing the event data.</param>
/// <remarks></remarks>
protected void gvSticker_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
{
if (Session["FisherId"] != null)
{
if (e.Row.RowType == DataControlRowType.DataRow)

[Code]....