I wan to open popup on click button

Question

Hello sir i want to open popup on click button first check condition and then open popup

 

here are code for it.

 

This is button where i want to open popup

<asp:Button runat="server" ID="btnForwardforvalidation" Text="Forward for Validation" CssClass="btn btn-primary"
OnClick="btnForwardforvalidation_Click" />

This is model popup

<!-- Modal Popup -->
<div id="MyPopup" class="modal fade" role="dialog">
<div class="modal-dialog">
<!-- Modal content-->
<div class="modal-content">
<div class="modal-header">
<div class="col-md-8">
<h3 style="color: green">Send Request For Approval</h3>
</div>
<div class="col-md-4">
<button type="button" class="close" data-dismiss="modal">
×</button>
</div>
<h4 class="modal-title"></h4>
</div>
<div class="modal-body">
<div class="row">
<div class="col-md-2">
<asp:Label runat="server">Select Employee : <span style="color:red">*</span> </asp:Label>
</div>
<div class="col-md-4">
<asp:DropDownList runat="server" ID="ddlemplist" CssClass="form-control select2" Width="100%"></asp:DropDownList>
<asp:HiddenField runat="server" ID="hidchkemplist" />
<asp:CustomValidator runat="server" ID="cvmodulelist" ClientValidationFunction="ValidateModuleList"
ErrorMessage="Please Select Atleast one Module" ValidationGroup="ab" ForeColor="#cc0000" Display="none"></asp:CustomValidator>
</div>
<div class="col-md-2">
<asp:Label runat="server">Meeting Date : <span style="color:red">*</span> </asp:Label>
</div>
<div class="col-md-4">
<asp:TextBox runat="server" ID="txtmeetingdate" type="Date" CssClass="form-control"></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ControlToValidate="txtmeetingdate" ErrorMessage="Meeting Date is Required !" Display="Dynamic" ValidationGroup="ab">
</asp:RequiredFieldValidator>
</div>
<div class="clearfix"></div>
<div class="col-md-12">
<asp:Label runat="server" ID="lblmsg" Visible="false" ForeColor="Red"></asp:Label>
</div>
</div>
<div class="clearfix"></div>
<br />
<div class="row">
<div class="col-md-12" align="center">
<asp:Button runat="server" ID="btnSendRequest" Text="Send Request For Approval" CssClass="btn btn-primary" OnClick="btnSendRequest_Click"
ValidationGroup="ab"></asp:Button>
<asp:ValidationSummary runat="server" ShowMessageBox="false" ShowSummary="true" ValidationGroup="ab" />
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-danger" data-dismiss="modal">
Close
</button>
</div>
</div>
</div>
</div>
<!-- Modal Popup -->

and this is my onclick event

protected void btnForwardforvalidation_Click(object sender, EventArgs e)
{
string check = "false";
foreach (GridViewRow grd in GRDPanelMeet.Rows)
{
CheckBox chkselect = (CheckBox)grd.FindControl("chkselect");
if (chkselect.Checked)
{
check = "true";
}
}
if (check == "false")
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('Msg|Please select atleast one checkbox !');", true);
}
else
{
//Here I want to open popup
}
}