how to store values of (that are generated through jquery) from code behind.

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C#

ASP.NET

jQuery

i am developing a web page that will create rows and columns of text boxes on button click and will save values in sql through stored procedure.
i have searched and tried different tecniques but no working.
page is in master client.
.aspx page

<script type="text/javascript" >
      var index = 1;

      function addrow() {
          var row = $('tr', "#table").length; //row the number of rows in table start from 0
          // alert("rowcount="+row+"");
          if (row == 6) {
              alert("only 06 lines allowed");
          } else {
              // alert(index);
              index++;
              var td;
              //               var row = $('tr', "#table").length; //row the number of rowsin table start from 0
              //alert("row"+row+"");
              var col = $("#table").find('tr')[0].cells.length; //col= no of columns in table tells the loop 
              // alert("col"+col+"");
              for (var i = 0; i < col; i++) {
                  td = td + '<td><input type="text" name="txt_' + row + '_' + i + '" runat="server" /></td>';
              }
              $('#table tr:last').after('<tr>' + td + '</tr>');
          }
      }


      function del_row(table) {
          table.each(function () {
              //alert($('tr', this).length);
              if ($('tr', this).length > 1) {
                  $('tbody tr:last', this).remove();
              }
          });
      }

      //debugger;
      function addcol() {
          //           alert("function has been called");
          var rcnt = 0; //=index in addrow
          ShowColCount();
          var colnum = $("#table").find('tr')[0].cells.length;     // colnum=no of columns to be added
          var rowlen = $('tr', "#table").length;
          if (colnum >= 7) {
              alert("you can add maximum 7 columns");
              return false;
          }
          else {
              $("#table").find('tr').each(function () {
                  $(this).find('td').eq(colnum - 1).after('<td><input  type="text" name="txt_' + rcnt + '_' + colnum + '" runat="server" /></td>');
                  rcnt++;
              });
          }
      }

      function ShowColCount() {
          var colnum = $("#table").find('tr')[0].cells.length;
          return colnum;
      }

      function del_col() {
          // alert("in" + colm + ""); 
          var colnum = $("#table").find('tr')[0].cells.length;     // colnum=no of columns to be added
          var rowlen = $('tr', "#table").length;
          $("#table tr").each(function () {
              if (colnum == 3 || rowlen == 0) {// alert("no more to delete");
              } else {
                  $(this).find("td:last").remove();
              }
          });
      }
   </script>

<div id="add_div" class="add_row_clm_div">
        <input id="btn_addrow" type="button" value="Add Row"   önclick="addrow();" /> 
        <input id="btn_del_row" type="button" value="Delete Row"   önclick="del_row($('#table'));" />
        <input id="btn_addcol" type="button" value="Add Column"   önclick="addcol();" /> 
        <input id="btn_delcol" type="button" value="Delete Column"   önclick="del_col();" /> 
        
            <input id="txt_0_0" type="text" name="txt_1_1"  runat="server" />
        
        
        
        
            <input id="txt_0_1" type="text" name="txt_1_2"  runat="server" />
        
        
        
            <input id="txt_0_2" type="text" name="txt_1_3"  runat="server" />

the method is post in master page form
and input type="text" is in table in 1 row and three cols
here is the code i am using in aspx.cs file

protected void btn_insert_Click(object sender, EventArgs e)
    {
hiddenfield();
}
      protected void hiddenfield()
    {
        SqlConnection conn = GetConnected();

        SqlCommand cmd = new SqlCommand("offers_2", conn);
        cmd.CommandType = CommandType.StoredProcedure;
        if (hf1.Value == "")
        {
            int col1 = 1;
            int row=0;
            int col;
            //for ( row = 0; row <= 5; row++)
             while(row<=5)
            {
                for ( col = 0; col <= 6; col++)
                {//hf1= id and name of hidden field
                    //hf1.Value =("txt_"+ row +"_"+ col +"");
                    hf1.Value = Request["txt_" + row + "_" + col + ""]== null?"NO VALUE":"VALUE";
                    
                    cmd.Parameters.AddWithValue("@col"+ col1+"_"+row+ "", hf1.Value);
                    col1++;
                }
                row++;
                col1 = 1;
            }
        }
        cmd.ExecuteNonQuery();
    }

now the problem is that the text boxes that i have put manually pass the value to method but not the values of textboxes created/generated dynamically. Request[] or Request.Form[] or Page.Request.Form[] are getting null=true always for dynamic textboxes values.

thanks in advance