database insert using MS Application block ExecuteNonQuery method

Hi all, I'm new to c# and am trying to do a basic insert into a sql database. I keep getting the following error -

System.Data.SqlClient.SqlException: Error converting data type char to int. at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) in C:\Program Files\Microsoft Application Blocks for .NET\Data Access v2\Code\CS\Microsoft.ApplicationBlocks.Data\SQLHelper.cs:line 335 at CZRDP.RDCPages.NewRecord.butSubmitDetails_Click(Object sender, EventArgs e) in e:\rmds\czrdp\rdcpages\newrecord.aspx.cs:line 385

This is the code that I'm using any help would be much appreciated

SqlParameter paramSubscriber = new SqlParameter("@SubscriberNo", SqlDbType.Char, 20,"SubscriberNo");
                    paramSubscriber.Value = txtSubscriberNumber.Text;
                    SqlParameter paramAccType = new SqlParameter("@AccountTypeID", SqlDbType.Int, 4,"AccountTypeID");
                    paramAccType.Value = drpAccType.SelectedValue;                                  
                    SqlParameter paramComp = new SqlParameter("@Competitor",SqlDbType.Bit,1,"Competitor");
                    paramComp.Value = chkCompetitor.Checked;                        
                    SqlParameter paramCompName = new SqlParameter("@CompanyName",SqlDbType.Char,80,"CompanyName");
                    paramCompName.Value = txtCompanyName.Text;
                    SqlParameter paramSalutation = new SqlParameter("@SalutationID",SqlDbType.Int,4,"SalutationID");
                    paramSalutation.Value = drpSupportSalutation.SelectedValue;
                    SqlParameter paramFirstName = new SqlParameter("@FirstName",SqlDbType.Char,80,"FirstName");
                    paramFirstName.Value = txtFirstName.Text;
                    SqlParameter paramLastName = new SqlParameter("@LastName",SqlDbType.Char,80,"LastName");
                    paramLastName.Value = txtLastName.Text;
                    SqlParameter paramSupportLevel = new SqlParameter("@SupportLevelID",SqlDbType.Int,4,"SupportLevelID");
                    paramSupportLevel.Value = drpSupportLevel.SelectedValue;
                    SqlParameter paramProduct = new SqlParameter("@ProductID",SqlDbType.Int,4,"ProductID");
                    paramProduct.Value = drpSupportedProducts.SelectedValue;
                    SqlParameter paramAddr1 = new SqlParameter("@Address1",SqlDbType.Char,80,"Address1");
                    paramAddr1.Value = txtaddress1.Text;
                    SqlParameter paramAddr2 = new SqlParameter("@Address2",SqlDbType.Char,80,"Address2");
                    paramAddr2.Value = txtaddress2.Text;
                    SqlParameter paramCity = new SqlParameter("@City",SqlDbType.Char,80,"City");
                    paramCity.Value = txtcity.Text;
                    SqlParameter paramCounty = new SqlParameter("@County",SqlDbType.Char,80,"County");
                    paramCounty.Value = txtcounty.Text;
                    SqlParameter paramPostcode = new SqlParameter("@Postcode",SqlDbType.Char,10,"Postcode");
                    paramPostcode.Value = txtPostcode.Text;
                    SqlParameter paramCountry = new SqlParameter("@Country",SqlDbType.Char,80,"Country");
                    paramCountry.Value = txtCountry.Text;
                    SqlParameter paramPhone = new SqlParameter("@PhoneNo",SqlDbType.Char,40,"PhoneNo");
                    paramPhone.Value = txtPhoneNumber.Text;
                    SqlParameter paramCCSSalutation = new SqlParameter("@CCSSalutationID",SqlDbType.Int,4,"CCSSalutationID");
                    paramCCSSalutation.Value = drpSupportSalutation.SelectedValue;
                    SqlParameter paramCCSSFirstName = new SqlParameter("@CCSFirstName",SqlDbType.Char,80,"CCSFirstName");
                    paramCCSSFirstName.Value = txtSupportFirstName.Text;
                    SqlParameter paramCCSSLastName = new SqlParameter("@CCSLastName",SqlDbType.Char,80,"CCSLastName");
                    paramCCSSLastName.Value = txtSupportLastName.Text;
                    SqlParameter paramCCSRole = new SqlParameter("@CCSRole",SqlDbType.Char,80,"CCSRole");
                    paramCCSRole.Value = txtClientRole.Text;
                    SqlParameter paramMembershipStartDate = new SqlParameter("@MembershipStartDate",SqlDbType.DateTime,8,"MembershipStartDate");
                    paramMembershipStartDate.Value = txtMembershipDate.Text;
                    SqlParameter paramAgreeDate = new SqlParameter("@RDCAgreementDate",SqlDbType.DateTime,8,"RDCAgreementDate");
                    paramAgreeDate.Value = txtSignedAgreeDate.Text;
                    SqlParameter paramContractType = new SqlParameter("@ContractTypeID",SqlDbType.Int,4,"ContractTypeID");
                    paramContractType.Value = drpContractType.SelectedValue;
                    SqlParameter paramContractTypeDate = new SqlParameter("@ContractTypeSignedDate",SqlDbType.DateTime,8,"ContractTypeSignedDate");
                    paramContractTypeDate.Value = txtSignedConType.Text;
                    SqlParameter paramAccManager = new SqlParameter("@AccountManager",SqlDbType.Char,80,"AccountManager");
                    paramAccManager.Value = txtAccManager.Text;
                    SqlParameter paramBusAdmin = new SqlParameter("@BusinessAdmin",SqlDbType.Char,80,"BusinessAdmin");
                    paramBusAdmin.Value = txtBusinessAdmin.Text;
                    SqlParameter paramNamedEmail = new SqlParameter("@NamedUserEmailAddress",SqlDbType.Char,80,"NamedUserEmailAddress");
                    paramNamedEmail.Value = txtSupportEmailAddress.Text;
                    SqlParameter paramSupportEmail = new SqlParameter("@CCSEmailAddress",SqlDbType.Char,80,"CCSEmailAddress");
                    paramSupportEmail.Value = txtEmailAddress.Text;
                    SqlParameter paramOldRevenue = new SqlParameter("@OldRevenue",SqlDbType.Int,4,"OldRevenue");
                    paramOldRevenue.Value = txtOldOldRevenue.Text;
                    SqlParameter paramOldNewRevenue = new SqlParameter("@OldNewRevenue",SqlDbType.Int,4,"OldNewRevenue");
                    paramOldNewRevenue.Value = txtOldNewRevenue.Text;
                    SqlParameter paramNewNewRevenue = new SqlParameter("@NewNewRevenue",SqlDbType.Int,4,"NewNewRevenue");
                    paramNewNewRevenue.Value = txtNewNewRevenue.Text;
                    SqlParameter paramCreditsBought = new SqlParameter("@TotalCreditsBought",SqlDbType.Int,4,"TotalCreditsBought");
                    paramCreditsBought.Value = txtCreditsBought.Text;
                    SqlParameter paramCreditsUsed = new SqlParameter("@TotalCreditsUsed",SqlDbType.Int,4,"TotalCreditsUsed");
                    paramCreditsUsed.Value = txtCreditsUsed.Text;
                    SqlParameter paramDateOpened = new SqlParameter("@DateOpened",SqlDbType.DateTime,8,"DateOpened");
                    paramDateOpened.Value = txtDateOpened.Text;
                    SqlParameter paramDateClosed = new SqlParameter("@DateClosed",SqlDbType.DateTime,8,"DateClosed");
                    paramDateClosed.Value = txtDateClosed.Text;
                    SqlParameter paramSiebelSRNo = new SqlParameter("@SiebelSRNo",SqlDbType.Char,80,"SiebelSRNo");
                    paramSiebelSRNo.Value = txtSiebelNumber.Text;
                    SqlParameter paramBillable = new SqlParameter("@Billable",SqlDbType.Bit,1,"Billable");
                    paramBillable.Value = chkBillable.Checked;
                    SqlParameter paramRegion = new SqlParameter("@RegionID",SqlDbType.Int,4,"RegionID");
                    paramRegion.Value = drpRegionID.SelectedValue;
                    SqlParameter paramClientStatus = new SqlParameter("@ClientStatusID",SqlDbType.Int,4,"ClientStatusID");
                    paramClientStatus.Value = drpSupportClientStatus.SelectedValue;
                   
               try
               {
                    int result;
                    result = SqlHelper.ExecuteNonQuery(SqlUtility.Connection,CommandType.StoredProcedure,"itblSubscriber",paramSubscriber,paramAccType,
                         paramComp,paramCompName,
                         paramSalutation,paramFirstName,
                         paramLastName,paramSupportLevel,
                         paramProduct,paramAddr1,
                         paramAddr2,paramCity,
                         paramCounty,paramPostcode,
                         paramCountry,paramPhone,
                         paramCCSSalutation,paramCCSSFirstName,
                         paramCCSSLastName,paramCCSRole,
                         paramMembershipStartDate,
                         paramAgreeDate,
                         paramContractType,
                         paramContractTypeDate,
                         paramAccManager,paramBusAdmin,
                         paramNamedEmail,paramSupportEmail,
                         paramOldRevenue,paramOldNewRevenue,
                         paramNewNewRevenue,paramCreditsBought,
                         paramCreditsUsed,paramDateOpened,
                         paramDateClosed,paramSiebelSRNo,
                         paramBillable,paramRegion,
                         paramClientStatus);    
               }          
               catch (Exception ex)
               {
                    Response.Write(ex.ToString());
               }
               Response.Redirect("SearchRecord.aspx",true);
          }