Common WCF Exception : Connection Unexpectedly Closed

[DataContract]
public enum Priority
{
    Low,
    Medium,
    High
}

[DataContract]
public struct TimeInfo
{
    [DataMember]
    public Int16 EstimatedHours { get; set; }

    [DataMember]
    public Int16 ActualHours { get; set; }

    [DataMember]
    public DateTime StartDate { get; set; }

    [DataMember]
    public DateTime EndDate { get; set; }

    [DataMember]
    public DateTime CompletionDate { get; set; }
}

[DataContract]
public class Task
{
    [DataMember]
    public string Title { get; set; }

    [DataMember]
    public string Description { get; set; }

    [DataMember]
    public Priority Priority { get; set; }

    [DataMember]
    public TimeInfo TimeInformation { get; set; }

    [DataMember]
    public Decimal Cost { get; set; }
}

[ServiceContract]
public interface ITaskManagement
{
    [OperationContract]
    List<Task> GetTasks();

    [OperationContract]
    void CreateTask(Task taskToCreate);

    [OperationContract]
    void UpdateTask(Task taskToCreate);

    [OperationContract]
    void DeleteTask(Task taskToDelete);
}

var client = new TaskManagementClient();

textBox1.Text = client.GetTasks().ToString();

client.Close();

<system.serviceModel>
    <bindings>
        <wsHttpBinding>
            <binding name="WSHttpBinding_ITaskManagement" closeTimeout="00:01:00"
                openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
                maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
                messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
                allowCookies="false">
                <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
                    maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                <reliableSession ordered="true" inactivityTimeout="00:10:00"
                    enabled="false" />
                <security mode="Message">
                    <transport clientCredentialType="Windows" proxyCredentialType="None"
                        realm="" />
                    <message clientCredentialType="Windows" negotiateServiceCredential="true"
                        algorithmSuite="Default" establishSecurityContext="true" />
                </security>
            </binding>
        </wsHttpBinding>
    </bindings>
    <client>
        <endpoint address="http://localhost:9999/TaskManagement.svc"
            binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_ITaskManagement"
            contract="TaskManagement.ITaskManagement" name="WSHttpBinding_ITaskManagement">
            <identity>
                <dns value="localhost" />
            </identity>
        </endpoint>
    </client>
</system.serviceModel>

<system.serviceModel>
    <behaviors>
        <serviceBehaviors>
            <behavior name="InternetBasedWcfServices.TaskManagementBehavior">
                <serviceMetadata httpGetEnabled="true" />
                <serviceDebug includeExceptionDetailInFaults="false" />
            </behavior>
            <behavior name="InternetBasedWcfServices.ScheduleManagementBehavior">
                <serviceMetadata httpGetEnabled="true" />
                <serviceDebug includeExceptionDetailInFaults="false" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
    <services>
        <service behaviorConfiguration="InternetBasedWcfServices.TaskManagementBehavior"
            name="InternetBasedWcfServices.TaskManagement">
            <endpoint address="" binding="wsHttpBinding" contract="InternetBasedWcfServices.ITaskManagement">
                <identity>
                    <dns value="localhost" />
                </identity>
            </endpoint>
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        </service>
        <service behaviorConfiguration="InternetBasedWcfServices.ScheduleManagementBehavior"
            name="InternetBasedWcfServices.ScheduleManagement">
            <endpoint address="" binding="wsHttpBinding" contract="InternetBasedWcfServices.IScheduleManagement">
                <identity>
                    <dns value="localhost" />
                </identity>
            </endpoint>
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        </service>
    </services>
</system.serviceModel>

[DataContract]
public enum Priority
{
    [EnumMember]
    Low,
    [EnumMember]
    Medium,
    [EnumMember]
    High
}

public enum Priority
{
  Low,
  Medium,
  High
}

new DateTime(adate.Year, adate.Month, firstday).ToString("d", cultureInfo);

CultureInfo culture = new CultureInfo(this.aculture.Name);
Convert.ToString(new DateTime(adate.Year, adate.Month, firstday), culture);

<dataContractSerializer maxItemsInObjectGraph="2147483647" />