Hi this is Zuber
I am written a code on navigating a page, but I cant execute 
Please help me anyone
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VF Page Code:
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<apex:page sidebar="false" setup="false" showHeader="true" tabStyle="Customer__c" controller="SourcePageController" >
<apex:sectionHeader title="Source Page" subtitle="Page Navigation"/>
<apex:form >
    <apex:pageblock title="Source Page Block">
        <apex:pageblockSection title="Source Page Section" collapsible="false" columns="1">
            <apex:inputtext label="Enter Customer Id : " value="{!customerId}"/>
            <apex:inputtext label="Enter Customer Name: " value="{!customerName}"/>
            <apex:commandButton value="Goto Target Page" action="{!GotoTargetPage}"/>
        </apex:pageblockSection>
    </apex:pageblock>
</apex:form>
</apex:page>
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Controller Class:
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public class SourcePageController 
{
    Public string customerId{get;set;}
    Public string customerName {get;set;}
    Public PageReference GotoTargetPage()
    {
        //Pagereference pgRef = new PageReference('/apex/TargetPage?custId='+customerId +'&custName='+customerName);
      PageReference pgRef = Page.TargetPage;
        pgRef.getParameters().Put('custID',customerId);
        pgRef.getParameters().Put('custName',CustomerNAme);
        pgRef.SetRedirect(true);
        return pgRef;
    }
}