[求助]GridView选择行问题

protected void gviewEmployee_SelectedIndexChanged(object sender, EventArgs e)
{
Label txtMsg = new Label();
switch (gviewEmployees.Rows[gviewEmployees.SelectedIndex].RowState)
{
case DataControlRowState.Selected:
txtMsg.Text = "你选择奇数行，行状态为" + gviewEmployees.Rows[gviewEmployees.SelectedIndex].RowState + ": " +
gviewEmployees.Rows[gviewEmployees.SelectedIndex].Cells[3].Text;
break;
case DataControlRowState.Alternate|DataControlRowState.Selected:
txtMsg.Text="你选择偶数行，行状态为"+gviewEmployees.Rows[gviewEmployees.SelectedIndex].RowState+": "+gviewEmployees.Rows[gviewEmployees.SelectedIndex].Cells[3].Text;
break;
}
Page.Controls.Add(txtMsg);
}


protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
PostBackOptions myPostBackOptions = new PostBackOptions(this);
myPostBackOptions.AutoPostBack = false;
myPostBackOptions.RequiresJavaScriptProtocol = true;
myPostBackOptions.PerformValidation = false;

String evt = Page.ClientScript.GetPostBackClientHyperlink(sender as System.Web.UI.WebControls.GridView, "Select$" + e.Row.RowIndex.ToString());

if (e.Row.RowType == DataControlRowType.DataRow)
{
//单击事件
e.Row.Attributes.Add("onclick", evt);
e.Row.Attributes["style"] = "Cursor:hand";

}
}

原来最好的办法是这样:
//建立奇数行与偶数行的onmouseover及onmouseout的颜色变换
if (Convert.ToInt16(ViewState["LineNo"]) == 0)
{
e.Row.BackColor = Color.FromArgb(255, 251, 214);
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='#FFFBD6';this.style.color='blue'");
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='#C0C0FF';this.style.color='#ffffff'");

ViewState["LineNo"] = 1;
}
else
{
e.Row.BackColor = Color.White;
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='#FFFFFF';this.style.color='blue'");
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='#C0C0FF';this.style.color='#ffffff'");

ViewState["LineNo"] = 0;
}

break;