How to pass Eval values using Conformation box in asp.net c#

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C#

ASP.NET

I am list all the project name with edit and delete option on datalist. I am used conformation box for delete button.Its worked.But when i clicked yes then the Project id is not passed via query string... I need to delete the particular project from database through that project id... How can i pass that id when user clicks yes on conformation box?


ASPX FILE:

<script type="text/javascript">
     //Confirmation box sample
     function ConfirmationBox() {
         var result = confirm("Are you sure you want to Delete?");
         if (result == true)
         {
             return true;
         }
         else {
             var lbl = document.getElementById('Resultlbl');
             lbl.innerHTML = "";
             return false;
         }
     }
          
<pre lang="xml"><asp:DataList ID="DataList1" runat="server" >
               <ItemTemplate>
               <table cellpadding="15" cellspacing="15" width="700px">
               <tr>
               <td class="Subheadfont" width="80%"><%# Eval("ProjectName")%></td>
               <td width="10%"><a href="Edit_Project.aspx?Proid=<%# Eval("ProjectID") %>">Edit</a></td><td width="10%"><a href="List Of Projects.aspx?Proid=<%#Eval("ProjectID")%>">
                   <asp:Button ID="BtnDelete" runat="server" OnClientClick="return ConfirmationBox()" onclick="btnSubmit_Click" Text="Delete"></asp:Button></a></td>
               </tr>
              <%-- <tr><td><a href="FullProjectDetails.aspx?Proid=<%# Eval("ProjectID") %>">
               <img src="Admin/ProImages/<%# Eval("Image1") %>" width="180px" alt="" height="150px" /></a>
               </td> </tr>--%>
               </table>
               </ItemTemplate>
               </asp:DataList>

ASPX.CS File:

public partial class ListAllProjects : System.Web.UI.Page
{
    Admin Objadmin = new Admin();
    int proid;
    protected void Page_Load(object sender, EventArgs e)
    {
        BindProjects();    
    }

    public void BindProjects()
    {
        DataSet ds = new DataSet();
        ds = Objadmin.View_All_Projects();
        DataList1.DataSource = ds;
        DataList1.DataBind();
    }

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        proid = Convert.ToInt32(Request.QueryString["Proid"]);

        if (proid > 0)
        {
           // Delete Record in Database

            String check = Objadmin.Delete_Project(proid);
            if (check == "yes")
            {
                Resultlbl.Visible = true;
                Resultlbl.Text = "Project Deleted Successfully!";
                BindProjects();
            }
            else
            {
                Resultlbl.Visible = true;
                Resultlbl.Text = "Project Not Deleted!";
            }
        }
        else
        {

            BindProjects();
        }
    }
}