GridView选择行变色，选择另外一行之后先前选择的行恢复，刚选择的行变色

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//鼠标经过时，行背景色变
//e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='#E6F5FA'");
////鼠标移出时，行背景色变
//e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='#FFFFFF'");

e.Row.Attributes.Add("onclick ", "if(window.oldtr!=null){window.oldtr.runtimeStyle.cssText= ' ';}this.runtimeStyle.cssText= 'background-color:#e6c5fc ';window.oldtr=this ");
}
}