problem getting with bootstrap Admin LTE theme

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C#

ASP.NET

C#3.5

HI guys,

I'm using bootstrap theme n master page in asp.net project.

n i dont have any UpdatePanel also.

Just, i have checkbox n some other controls in a repeater, in asp.net page.

But in the code behind,

the checkbox checked value getting false, instead of true.

<asp:Repeater ID="Repeater1" runat="server" EnableTheming="True">
            <HeaderTemplate>
                <table class="table table-bordered table-hover">
                    <thead class="bg-light-blue">
                        <tr>
                            <th>
                                S.No.
                            </th>
                            <th>
                                Select
                            </th>
                            <th>
                                Main Chemicals
                            </th>
                            <th>
                                15%
                            </th>
                            <th>
                                20%
                            </th>
                            <th>
                                No.of Rows
                            </th>
                            <th>
                                Volume
                            </th>
                        </tr>
                    </thead>
                    <tbody>
            </HeaderTemplate>
            <ItemTemplate>
                <tr>
                    <td valign="middle" align="center" style="width: 50px" class="bg-gray">
                        <b style="color: Black">
                            <%# Container.ItemIndex + 1 %>
                        </b>
                    </td>
                    <td align="center" style="width: 50px">
                        <asp:CheckBox ID="chkSelect" runat="server" />
                    </td>
                    <td>
                        <asp:Label ID="lblchm" CssClass="textBlack" Font-Bold="true" runat="server" Text='<%# Eval("CName") %>'></asp:Label>
                        <asp:HiddenField ID="hdnChemical" runat="server" Value='<%# Eval("RecID") %>' />
                    </td>
                    <td align="center" style="width: 50px">
                        <asp:RadioButton ID="rb15" GroupName="percentage" runat="server" />
                    </td>
                    <td align="center" style="width: 50px">
                        <asp:RadioButton ID="rb20" GroupName="percentage" runat="server" />
                    </td>
                    <td>
                        <asp:TextBox ID="txtrows" runat="server" CssClass="form-control" AutoPostBack="False"></asp:TextBox>
                        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtrows"
                            SetFocusOnError="true" ForeColor="Red" ErrorMessage="Please Enter Only Numeric"
                            Style="z-index: 101; left: 424px; position: absolute; top: 285px" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>
                    </td>
                    <td>
                        <asp:TextBox ID="txtvolume" runat="server" CssClass="form-control" AutoPostBack="False"></asp:TextBox>
                        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtvolume"
                            SetFocusOnError="true" ForeColor="Red" ErrorMessage="Please Enter Only Numeric"
                            Style="z-index: 101; left: 424px; position: absolute; top: 285px" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>
                    </td>
                </tr>
            </ItemTemplate>
            <FooterTemplate>
                </tbody> </table>
            </FooterTemplate>
        </asp:Repeater>
<br />

<table width="100%">
    <tr>
        <td align="center">
            <asp:Button ID="btncncl" runat="server" Text="Cancel" CssClass="btn btn-sm btn-danger"
                Font-Bold="True" OnClick="btncncl_Click" />&nbsp
            <asp:Button ID="btnok" runat="server" Text="Next >>" CssClass="btn btn-sm btn-primary"
                Font-Bold="True" OnClick="btnnext_Click" />
        </td>
    </tr>
</table>

pageload:

if (!IsPostBack)
            {
                

                    int recid = Convert.ToInt32(Request.QueryString["RECID"]);
                    getProjectDetails(recid);
                    Fill_Repeater();

                }

Insertion Code:

protected void btnnext_Click(object sender, EventArgs e)
       {
           int i = 0;
           int PrjID = Convert.ToInt32(Request.QueryString["RECID"]);
           foreach (RepeaterItem item in Repeater1.Items)
           {
               //TextBox t = (TextBox)item.FindControl("txtrows");
               CheckBox chk = (CheckBox)item.FindControl("chkSelect");

                   if (chk.Checked)//getting false
                   {
                       RadioButton rb1 = (RadioButton)item.FindControl("rb15");
                       RadioButton rb2 = (RadioButton)item.FindControl("rb20");

                       bool fifteen = rb1.Checked;
                       bool twenty = rb2.Checked;

                       HiddenField hdn = (HiddenField)item.FindControl("hdnChemical");
                       int ChemicalID = Convert.ToInt32(hdn.Value);

                       TextBox rows = (TextBox)item.FindControl("txtrows");
                       string sRows = rows.Text;
                       TextBox vol = (TextBox)item.FindControl("txtvolume");
                       string svol = vol.Text;

                       //Insert query here!
                       string data = PrjID + "," + fifteen + "," + twenty + "," + sRows + "," + svol + "," + Session["UserRecID"].ToString() + "," + ChemicalID.ToString();
                       i = bl.InsertAssignChemicals(data);

                   }

           }

           if (i > 0)
           {
               bl.UpdateProjectStatus(PrjID, 2);
               Response.Redirect("ProjectList.aspx");
           }

       }

can anyone... plzzz help me.

thnx