Ref:
If you want to have searching only for County column then please change these code.
JavaScript
<script type="text/javascript">
$(function () {
$('.search_textbox').each(function () {
$(this).quicksearch("[id*=GridView1] tr:not(:has(th))", {
'testQuery': function (query, txt, row) {
return $(row).children(":eq(" + 2 + ")").text().toLowerCase().indexOf(query[0].toLowerCase()) != -1;
}
});
});
});
</script>
C#
protected void OnDataBound(object sender, EventArgs e)
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);
for (int i = 0; i < GridView1.Columns.Count; i++)
{
TableHeaderCell cell = new TableHeaderCell();
if (i == GridView1.Columns.Count - 1)
{
TextBox txtSearch = new TextBox();
txtSearch.Attributes["placeholder"] = GridView1.Columns[i].HeaderText;
txtSearch.CssClass = "search_textbox";
cell.Controls.Add(txtSearch);
}
row.Controls.Add(cell);
}
GridView1.HeaderRow.Parent.Controls.AddAt(1, row);
}
Screenshot
Filtered Record by Country
