ASP.NET

<telerik:RadGrid ID="RagCategories" runat="server" Height="399px" Width="698px" AutoGenerateColumns="False" Skin="Sunset" OnDataBound="RagCategories_DataBound">
                        <MasterTableView>
                        <RowIndicatorColumn>
                        <HeaderStyle Width="20px"></HeaderStyle>
                        </RowIndicatorColumn>
                        <Columns>
                        <telerik:GridTemplateColumn DataField="CategoryID" HeaderText="ID" UniqueName="TemplateColumn">
                        <ItemTemplate>
                        <asp:Label ID="lblID" Font-Bold="true" runat="server" Text='<%# Eval("CategoryID")%>' ></asp:Label>
                        </ItemTemplate>
                        </telerik:GridTemplateColumn>
                        <telerik:GridTemplateColumn HeaderText="Forum Categories" UniqueName="TemplateColumn1">
                        <ItemTemplate>
                        <asp:HyperLink id="link1" Text='<%# Eval("CATEGORYNAME")%>'  NavigateUrl='<%# Eval("[LINK]")%>' runat="server" > </asp:HyperLink>
                        <asp:Label ID="descr" runat="server" Text='<%# Eval("Description")%>'></asp:Label>
                        </ItemTemplate><HeaderStyle Font-Bold="True">
                        </HeaderStyle>
                        </telerik:GridTemplateColumn>
                        </Columns>
                        <ExpandCollapseColumn>
                        <HeaderStyle Width="20px"></HeaderStyle>
                        </ExpandCollapseColumn>
                        </MasterTableView>
                        <FilterMenu EnableTheming="True" Skin="Sunset">
                        <CollapseAnimation Type="OutQuint" Duration="200">
                        </CollapseAnimation>
                        </FilterMenu>
    <ClientSettings>
        <ClientEvents OnRowClick="OnClientClick=&quot;javascript: return SetHidSelectedRows()&quot;" />
    </ClientSettings>
    </telerik:RadGrid>

<asp:HyperLink id="link1" Text='<%# Eval("CATEGORYNAME")%>'  NavigateUrl='<%# Eval("[LINK]")%>' runat="server" > </asp:HyperLink>

private void ExportExcelToPDF()
        {


            string sourceFilePath = Server.MapPath("~/aaa.xlsx");
            string destinationFilePath = Server.MapPath("~/aaa.pdf");

            Microsoft.Office.Interop.Excel.Application myExcelApp;

            Microsoft.Office.Interop.Excel.Workbooks myExcelWorkbooks = null;

            Microsoft.Office.Interop.Excel.Workbook myExcelWorkbook = null;

            try
            {

                object misValue = System.Reflection.Missing.Value;

                myExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass();

                myExcelApp.Visible = true;
                object varMissing = Type.Missing;

                myExcelWorkbooks = myExcelApp.Workbooks;


                //if file already exist then delete the file
                if (System.IO.File.Exists(destinationFilePath))
                {
                    System.IO.File.Delete(destinationFilePath);
                }

                myExcelWorkbook = myExcelWorkbooks.Open(sourceFilePath, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue);

                myExcelWorkbook.ExportAsFixedFormat(Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF,
                    destinationFilePath, Microsoft.Office.Interop.Excel.XlFixedFormatQuality.xlQualityStandard,
                    varMissing, false, varMissing, varMissing, false, varMissing);

                myExcelWorkbooks.Close();

                myExcelApp.Quit();

            }
            catch
            {

            }
            finally
            {
                myExcelApp = null;
            }


        }