private void DataBind()
{
string strWhere = "1=1";
if (DropDownList1.SelectedIndex > 0)
{
strWhere += "and WName='" + DropDownList1.SelectedValue + "'";
}
if (TextBox1.Text.Trim() != "")
{
strWhere += "and WName like '%" + TextBox1.Text.Trim() + "%'";
}
Gvexam.DataSource = bll.GetUserInfoList(strWhere);
Gvexam.DataBind();
}