How to open page in new tab from GridView?

Question

I want to open page in new tab while clicking on the gridview link button. But I want to open new page based on alert type. For example, from the given below grid I clicked link button of Alert1 then it should open alert1.aspx page, if it is Alert2 then alert2.aspx. etc Help me to find a proper solution. Thank you.

GridView:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" ShowHeader="False"> 
    <Columns>
    <asp:TemplateField HeaderText="Alert Type" SortExpression="Alert_Type">
    <EditItemTemplate>
    <asp:Label ID="Label1" runat="server" Text='<%# Eval("Alert_Type") %>'>
    </asp:Label>
    </EditItemTemplate>
    <ItemTemplate>
    <asp:Label ID="Label1" runat="server" Text='<%# Bind("Alert_Type") %>'>
    </asp:Label>
    </ItemTemplate>
    </asp:TemplateField>
    <asp:BoundField DataField="Created_Time" HeaderText="Created Time" 
    ReadOnly="True" SortExpression="Created_Time" />
    <asp:TemplateField >
    <ItemTemplate>
    <asp:LinkButton ID="lnk" runat="server" Text="Click" OnClick="lnk_Click">
    </asp:LinkButton>
    </ItemTemplate>
    </asp:TemplateField>
    </Columns>                
 </asp:GridView>

C#:

protected void lnk_Click(object sender, EventArgs e)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "OpenWindow", "window.open('alert1.aspx','_newtab');", true);
}

Answer 1

Here's the solution that you looking for:

 protected void lnk_Click(object sender, EventArgs e)
 {
      LinkButton lnk = sender as LinkButton;
      Label Label1 = lnk.NamingContainer.FindControl("Label1") as Label;

      if (Label1.Text == "Alert1")
      {
          Page.ClientScript.RegisterStartupScript(this.GetType(), "OpenWindow", "window.open('alert1.aspx','_blank');", true);
      }
      else if (Label1.Text == "Alert2")
      {
          Page.ClientScript.RegisterStartupScript(this.GetType(), "OpenWindow", "window.open('alert2.aspx','_blank');", true);
      }
 }

Also, Give unique names to controls inside GridView.