Record is not inserted even though DML operation has not thrown any error

Question

I just created a new object variable to student__c and tried to insert the record with the values received from VF page i.e. when i clicked on the submit button, it has not shown any error message. But when i checked the tab in the app with my custom object Student__c, there is no records is inserted with the process i have done below. Please help this processed.

apex class:

public class ProcessAdmission {

    private ApexPages.StandardController controller;
    public String StdFName{get; set;}
    public String StdLName{get; set;}
    public String StdMName{get; set;}
    public String StdFatherName{get; set;}
    public String StdMotherName{get; set;}
    public Date DOB{get; set;}
    public String email{get; set;}
    public String Mobilenbr{get; set;}
    public String joinClass{get; set;}
    public String address {get; set;}
    public Integer  StudentId {get; set;}
    public String gendervalue{get; set;}
    public Student__c datarecords{get; set;}

    public ProcessAdmission(ApexPages.StandardController cont)
    {
       this.controller = cont;
       datarecords =  new Student__c();       
    }

    public void submit()
    {
        Student__c newRec = new Student__C();
        newRec.Address__c           = address ;
        newRec.Contact_email_Id__c  = Mobilenbr;
        newRec.Date_of_Birth__c     = DOB;
        newRec.Father_Name__c       = StdFatherName;
        newRec.Gender__c            = genderValue;
        newRec.Join_Class__c        = JoinClass;
        newRec.Mobile_number__c     = mobileNbr;
        newRec.Mother_Name__c       = StdmotherName;
        newRec.Student_First_Name__c = StdFName;
        newRec.Student_Last_Name__c  = StdLName;
        newRec.Student_Middle_Name__c = stdMname;

        insert newRec;
    }
}

Visualforce Page:

<apex:page standardController="Student__c" extensions="ProcessAdmission">
    <apex:form >
        <apex:pageBlock >

    <apex:pageBlockSection title="New Student Admission">

                <apex:outputLabel id="inputtxta" value="First Name" for="StdFName"/>
                <apex:inputText id="StdFName" value="{!StdFName}"/>
                <apex:outputLabel id="inputtxtab" value="Middle Name" for="StdMName"/>
                <apex:inputText id="StdMName" value="{!StdMName}"/>
                <apex:outputLabel id="inputtxtb" value="Last Name" for="StdLName"/>
                <apex:inputText id="StdLName" value="{!StdLName}"/>
                <apex:outputLabel id="inputtxtc" value="Father's Name " for="StdFatherName"/>
                <apex:inputText id="StdFatherName" value="{!StdFatherName}"/>
                <apex:outputLabel id="inputtxtd" value="Mother's Name " for="StdMotherName"/>
                <apex:inputText id="StdMotherName" value="{!StdMotherName}"/>
                <apex:outputLabel id="inputtxte" value="Address" for="Stdadress"/>
                <apex:inputText id="StdAdress" value="{!address}"/>
        <apex:outputLabel id="inputtxtf" value="mobile" for="mobile"/>
                <apex:inputText id="mobile" value="{!Mobilenbr}"/>
        <apex:outputLabel id="inputtxtg" value="emailId" for="EmailID"/>
                <apex:inputText id="EmailId" value="{!email}"/>
        <apex:outputLabel id="inputtxth" value="dateofbrith" for="dateofbirth"/>
                <apex:inputText id="dateofbirth" value="{!DOB}"/>

                <apex:outputLabel id="selectLista" value="Gender" for="StdGender"/>
                <apex:selectList id="StdGender" value="{!Gendervalue}" size="1">
                    <apex:selectOption itemValue="Male" itemLabel="male" />
                    <apex:selectOption itemValue="Female" itemLabel="female"/>
                    <apex:selectOption itemValue="Transgender" itemLabel="TansGender"/>
                </apex:selectList>


          <apex:selectList id="StdClass" value="{!JoinClass}" size="1">
                    <apex:selectOption itemValue="V" itemLabel="five" />
                    <apex:selectOption itemValue="VI" itemLabel="six"/>
                    <apex:selectOption itemValue="VII" itemLabel="seven"/>
              <apex:selectOption itemValue="VIII" itemLabel="eigth"/>
              <apex:selectOption itemValue="IX" itemLabel="nine"/>
              <apex:selectOption itemValue="X" itemLabel="ten"/>
                </apex:selectList>
        <apex:outputLabel id="buttonid" value="button" for="validate"/>
              <apex:commandButton id="validate" value="Submit" action="{!submit}"/>
    </apex:pageBlockSection>
            </apex:pageBlock>

        </apex:form>
</apex:page>

Answer 1

I can't see a good reason for this to fail, but you should add an <apex:pageMessages/> tag to your page to see any errors that might be generated.

That aside, you could make this page and controller far simpler! Instead of creating member variables in the controller for each field, you simply need a public SObject instance, which you have as datarecords, but I'm changing to student since it makes more sense and isn't plural:

public Student__c student get; set;}

Then your page block section could look more like this:

<apex:pageBlockSection title="New Student Admission">
    <apex:inputField value="{!student.First_Name__c}"/>
    <apex:inputField value="{!student.Middle_Name__c}"/>
    <apex:inputField value="{!student.Last_Name__c}"/> 
    ... 

And finally your submit action would look like this:

public void submit()
{
    insert student;
}