How to Show Image in new Tab on gridview image button click?

Question

Hello, I want to show image in new tab when i click on particular image button in GridView. i tried some code which i mentioned below,but it didn't work for me. so help me how can i do this.

 

Front End Code

<asp:GridView ID="GridView1" runat="server" CssClass="table table-bordered table-hover" DataKeyNames="ID" OnRowCommand="GridView1_RowCommand" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" EmptyDataText="No records has been added." AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:TemplateField HeaderText="Photo">
<ItemTemplate>
<asp:ImageButton ID="imgRedirect" runat="server" Height="50px" Width="50px" ImageUrl='<%# Eval("img") %>' OnClick="imgRedirect_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

Backend Code

protected void imgRedirect_Click(object sender, ImageClickEventArgs e)
{
int getid = Convert.ToInt32(GridView1.Rows[GridView1.SelectedIndex].Cells[0].Text);
string imagename = string.Empty;
con.Open();
SqlCommand cmd = new SqlCommand("select * from AddPrescription where ID='"+ getid + "'", con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
imagename = dr["img"].ToString();
}
con.Close();
Response.Redirect(imagename);
}