How to get the value from gridview on click and set as a session variable?

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ASP.NET

WebForms

jQuery

Gridview

Hello Every One,
I am stuck with a problem, and the problem is i have created a grid view and there are 4 columns in it, what i want is when i click on Book Meeting Time column it should generate a session variable by storing user id.

Best Regards,
Thank You.

What I have tried:

Here Is The Code For GridView

<asp:GridView ID="GridView1" runat="server" ShowHeaderWhenEmpty="true" EmptyDataText="No Records Found." OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
            <columns>
<asp:TemplateField HeaderText="Book Meeting Time">
                    <ItemTemplate>
                    <a href="" id="clickme" onclick="LinkWith">Click Here</a>
                    </ItemTemplate>
                    
                </asp:TemplateField>
            </columns>
        </asp:GridView>

Here is my jquery code.

function myPartialView() {
            $(document).on('click', '#clickme', function () {
window.open("BookMeetingTimePopUp.aspx", "PopupWindow", "width=600,height=600,scrollbars=yes,resizable=no");
            })
        }

and Here Is my server side code

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            Database db = new Database();
            Session["USERID"] = GridView1.Rows[0].Cells[2];
        }

This is how my grid view looks like on clicking "Click Me" i want to create a session.

Book Meeting Time	FirstName	LastName	UserId	EmailAddress
Click Here	        Daniyal	        Farhan	        19000   daniyalfarhan@xyz.com
Click Here	        Daniyal	        Ahmed	        19200	daniyal@xyz.com