How to show the list of items on dropdown using linq

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C#

Linux

i have a class and i have created the method

public List<SycDepositType> GetAll()
      {
          List<SycDepositType> sycDepositType = null;
          try
          {
              sycDepositType = (DcSystemConfiguration.GetTable<SycDepositType>()).ToList<SycDepositType>();
          }
          catch (Exception ex)
          {
              ErrorWriter.WriteError(ex, "FunctionName --> GetDataTable", RequestPage);
          }
          return sycDepositType;
      }

and i have to show the items on dropdown ddlInterestTransfer the items on selecting the items on ddlDepositType.

protected void ddlDepositType_SelectedIndexChanged(object sender, EventArgs e)
    {
        //msg = new Message("", GlobalEnum.MessageStatus.Alert, GlobalEnum.MessageCss.Alert);
        //ConfirmationMessage1.SetMessage(msg);
        ConfirmationMessage1.EnableViewState = false;
        int s = Convert.ToInt32(ddlDepositType.SelectedValue);
        cSycDepositType = new CSycDepositType(HttpContext.Current.Request.RawUrl);
        var sycDepositType = cSycDepositType.GetBySycDepositTypeId(s);

                //Normal savings

        if(sycDepositType.SycDepositCategoryId == 1)
        {
            ddlInterestTransfer.Visible = false;
        }

                //Recurring savings

        else  if (sycDepositType.SycDepositCategoryId == 2)
        {
            ddlInterestTransfer.Visible = false;
        }
                 //fixed savings

        else if (sycDepositType.SycDepositCategoryId == 3)
        {
             ddlInterestTransfer.Visible = true;
             ddlInterestTransfer.DataSource = null;
            if ( sycDepositType.SycInterestCalculationPeriodId == 5)
            {

                cSycInterestCalculationType = new CSycInterestCalculationType(HttpContext.Current.Request.RawUrl);
                var sycInterestCalculationType = cSycInterestCalculationType.GetAll();
                ddlInterestTransfer.DataSource = sycInterestCalculationType;
                ddlInterestTransfer.DataTextField = sycInterestCalculationType;
                //ddlInterestTransfer.DataValueField = sycInterestCalculationType.ToList();
                //ddlInterestTransfer.DataBind();
            }
            else
            {
                cMamAccountOpeningDepositType = new CMamAccountOpening(HttpContext.Current.Request.RawUrl);
                var mamAccountOpeningDepositType = cMamAccountOpeningDepositType.GetAll();

            }


        }


    }

if if ( sycDepositType.SycInterestCalculationPeriodId == 5) then i have to show all items on ddlInterestTransfer with getall as done on shown code .

so how to show the items on dropdown from code.