Hi All,

I am getting this error ("System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out") on one custom button(Delete) click in salesforce.

In below code  i am geting the records from two instances and trying to delete the selected record: 

public with sharing class testchkcnt{

    public List<Accountwrapper> accntlist{get; set;}
    public List<Case> caselist{get; set;}
    public List<Account> selectedaccount = new List<Account>();
    public List<Cse> cselist{get; set;}
    public String lname{get; set;}
    Boolean testval = false;
    Boolean testcase = false;
    public String testcaseid{get; set;}

    public Class Cse
    {
        public String CaseNumber{get; set;}
        public String Status{get; set;}
    }   
    
    public pageReference search(){
        List<Accountwrapper> accnt1 = new List<Accountwrapper>();
        List<Accountwrapper> accnt2 = new List<Accountwrapper>();
        accntlist = new List<Accountwrapper>();
        List<Account> accn = [Select Id, Name, Phone from Account where Name =: lname] ;
        for(Account a: accn ){
            accnt1.add(new Accountwrapper(a));
        }
        partnerSoapSforceCom.Soap myPartnerSoap = new partnerSoapSforceCom.Soap();
        partnerSoapSforceCom.LoginResult partnerLoginResult = myPartnerSoap.login('test123@xxx.com', '**********');
        soapSforceComSchemasClassAllacoutsdd.SessionHeader_element webserviceSessionHeader = new soapSforceComSchemasClassAllacoutsdd.SessionHeader_element();
        webserviceSessionHeader.sessionId = partnerLoginResult.sessionId;
          
            soapSforceComSchemasClassAllacoutsdd.allAcoutsDetails  stub = new soapSforceComSchemasClassAllacoutsdd.allAcoutsDetails();
            stub.SessionHeader = webserviceSessionHeader;
            List<Account> lst_Account = new List<Account>();
            if(stub.makeaccount(lname) != null){
            for(soapSforceComSchemasClassAllacoutsdd.response li: stub.makeaccount(lname)){
                
                    Account acn = new Account();
                    acn.Id = li.AccId;
                    acn.Name = li.AccName;
                    acn.Phone = li.PhoneNum;
                    lst_Account.add(acn);
                }
            }

            for(Account an: lst_Account){
                accnt2.add(new Accountwrapper(an));
            }
        accntlist.addall(accnt1);
        accntlist.addall(accnt2);       
        if(accntlist.size()>0)
            setHideshow(true);
        else
            setHideshow(false);
        
        return null;
    } 
        
    public Boolean gethideshowcase()
    {
        return this.testcase ;
    }
    public void sethideshowcase(boolean q)
    {
        this.testcase = q;
    }
    
       public Boolean getHideshow()
    {
        return this.testval;
    }
    public void setHideshow(boolean s)
    {
        this.testval = s;
    }

    public pageReference GetCaseDetails(){
        caselist = new List<Case>();
        string st = ApexPages.currentPage().getParameters().get('testcaseid');
        caselist  = [Select Id, CaseNumber, Status from Case where AccountId =: st];
        cselist = new List<Cse>();
        sethideshowcase(true);

        if(caselist.size() == 0){
            partnerSoapSforceCom.Soap myPartnerSoap = new partnerSoapSforceCom.Soap();
            partnerSoapSforceCom.LoginResult partnerLoginResult = myPartnerSoap.login('test123@xxx.com', '*********');
            soapSforceComSchemasClassAllacoutsdd.SessionHeader_element webserviceSessionHeader = new soapSforceComSchemasClassAllacoutsdd.SessionHeader_element();
            webserviceSessionHeader.sessionId = partnerLoginResult.sessionId;
            
            soapSforceComSchemasClassAllacoutsdd.allAcoutsDetails  stub = new soapSforceComSchemasClassAllacoutsdd.allAcoutsDetails();
            stub.SessionHeader = webserviceSessionHeader;          
            for(soapSforceComSchemasClassAllacoutsdd.response lis: stub.allcasedetails(st)){
                Cse cs = new Cse();
                cs.CaseNumber = lis.cnumb;
                cs.Status = lis.Casestate;
                cselist.add(cs);
            }  
        }
        else
            {
            System.debug('Entering...');
                for(Case c: caselist)
                {
                    Cse cs = new Cse();
                    cs.CaseNumber = c.CaseNumber;
                    cs.Status = c.Status;
                    cselist.add(cs);
                }
            }
        if(cselist.size()==0)
            sethideshowcase(false);
        return null;
        }
   
    public pageReference deleteaccount(){
        List<Account> selAccounts=GetSelectedAccounts();
        List<Account> act_del = new List<Account>();
        if(selAccounts.size()>0){
            for(Integer j=0; j<selAccounts.size(); j++){
                act_del.add(selAccounts[j]);
            }
           delete act_del; 
            
        }
        return search();           
    }
    
    public List<Account> GetSelectedAccounts(){
        if(selectedaccount.size()>0){
            system.debug('##########' + selectedaccount);
            return selectedaccount ;  
        }     
        else{
            return null;
        }
    }
    
   public pageReference GetSelected(){
        selectedaccount.clear();
        system.debug('testingggggggggg');
        system.debug('abhi@@@@@@@' + accntlist);
        for(Accountwrapper accwrapper: accntlist)           
            if(accwrapper.selected == true)
                selectedaccount.add(accwrapper.acc);
        return null;
    }
     
    public class Accountwrapper{
        public Account acc{get; set;}
        public Boolean selected{get; set;}
        public Accountwrapper(Account a){
            acc = a;
            selected = false;
        }
    }    
}

Can someone help me how to resolve this issue?