The type or namespace name 'GanttProvider' could not be found (are you missing a using directive or an assembly reference?)

[Varun]

Hello,

I am facing an issue wherein on the page following issue is coming:-

Request Failed. Try Again.

When I debugged the code then I found that the issue is actually coming due to this class file not found:- GanttProvider the actual error in the code is showing that:
The type or namespace name 'GanttProvider' could not be found (are you missing a using directive or an assembly reference?)

<%@ WebService Language="C#" Class="GanttService" %>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.SessionState;
//using Telerik.Web.UIusing Telerik.Web.UI.Gantt;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
publicclassGanttService : System.Web.Services.WebService, IRequiresSessionState
{
    private WebServiceController _controller;

    public WebServiceController Controller
    {
        get
        {
            if (_controller == null)
            {
                _controller = new WebServiceController(new GanttProvider());
            }

            return _controller;
        }
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<CustomTaskData> GetTasks()
    {
        var ddd = Controller.GetTasks<CustomTaskData>();
        var provider = new GanttProvider();
        foreach (var item in ddd)
        {
            //item.Dependency = provider.GetSuccessorByTaskID((int)item.ID);
            item.Dependency = provider.GetPredecessorByTaskID((int)item.ID);
        }

        return ddd;
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<CustomTaskData> InsertTasks(IEnumerable<CustomTaskData> models)
    {
        var plannerRefId = HttpContext.Current.Session["GanttPlannerRefId"] != null ? Convert.ToInt32(HttpContext.Current.Session["GanttPlannerRefId"]) : 0;
        var plannerId = HttpContext.Current.Session["GanttPlannerID"] != null ? Convert.ToInt32(HttpContext.Current.Session["GanttPlannerID"]) : 0;
        var plannerType = HttpContext.Current.Session["GanttPlannerType"] != null ? HttpContext.Current.Session["GanttPlannerType"].ToString() : "project";
        if (plannerType.Equals("vendor", StringComparison.InvariantCultureIgnoreCase))
        {
            foreach (var item in models)
            {
                item.RootVendorID = plannerRefId;
                item.PlannerID = plannerId;
            }
        }else
        {
            foreach (var item in models)
            {
                item.ProjectID = plannerRefId;
                item.PlannerID = plannerId;
            }
        }
        return Controller.InsertTasks<CustomTaskData>(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<CustomTaskData> UpdateTasks(IEnumerable<CustomTaskData> models)
    {
        var plannerRefId = HttpContext.Current.Session["GanttPlannerRefId"] != null ? Convert.ToInt32(HttpContext.Current.Session["GanttPlannerRefId"]) : 0;
        var plannerId = HttpContext.Current.Session["GanttPlannerID"] != null ? Convert.ToInt32(HttpContext.Current.Session["GanttPlannerID"]) : 0;
        var plannerType = HttpContext.Current.Session["GanttPlannerType"] != null ? HttpContext.Current.Session["GanttPlannerType"].ToString() : "project";
        if (plannerType.Equals("vendor", StringComparison.InvariantCultureIgnoreCase))
        {
            foreach (var item in models)
            {
                item.RootVendorID = plannerRefId;
                item.PlannerID = plannerId;
            }
        }else
        {
            foreach (var item in models)
            {
                item.ProjectID = plannerRefId;
                item.PlannerID = plannerId;
            }
        }
        return Controller.UpdateTasks<CustomTaskData>(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<CustomTaskData> DeleteTasks(IEnumerable<CustomTaskData> models)
    {
        return Controller.DeleteTasks<CustomTaskData>(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<DependencyData> GetDependencies()
    {
        return Controller.GetDependencies();
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<DependencyData> InsertDependencies(IEnumerable<DependencyData> models)
    {
        return Controller.InsertDependencies(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<DependencyData> DeleteDependencies(IEnumerable<DependencyData> models)
    {
        return Controller.DeleteDependencies(models);
    }

    [WebMethod(EnableSession = true)]
    public IEnumerable<Telerik.Web.UI.Gantt.ResourceData> GetResources()
    {
        return Controller.GetResources();
    }

    [WebMethod(EnableSession = true)]
    public IEnumerable<AssignmentData> GetAssignments()
    {
        return Controller.GetAssignments();
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<AssignmentData> InsertAssignments(IEnumerable<AssignmentData> models)
    {
        return Controller.InsertAssignments(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<AssignmentData> UpdateAssignments(IEnumerable<AssignmentData> models)
    {
        return Controller.UpdateAssignments(models);
    }
    [WebMethod(EnableSession = true)]
    public IEnumerable<AssignmentData> DeleteAssignments(IEnumerable<AssignmentData> models)
    {
        return Controller.DeleteAssignments(models);
    }
}


[System.Runtime.Serialization.DataContract]
publicclassCustomTaskData : TaskData
{
    [System.Runtime.Serialization.DataMember]
    publicstring Description
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicint? ProjectID
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicint? PlannerID
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicstring CusTaskType
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicdouble? CusDuration
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicdouble? CusActualHour
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicint? VendorID
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicstring Vendor
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicint? RootVendorID
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicstring RootVendorName
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicstring ProjectName
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicstring Dependency
    {
        get;
        set;
    }

    [System.Runtime.Serialization.DataMember]
    publicint? PlannerTaskID
    {
        get;
        set;
    }
    [System.Runtime.Serialization.DataMember]
    publicint? ItemRefID
    {
        get;
        set;
    }
    public override void CopyFrom(ITask srcTask)
    {
        base.CopyFrom(srcTask);

        Description = ((CustomTaskData)srcTask).Description;
        ProjectID = ((CustomTaskData)srcTask).ProjectID;
        PlannerID = ((CustomTaskData)srcTask).PlannerID;
        CusTaskType = ((CustomTaskData)srcTask).CusTaskType;
        CusDuration = ((CustomTaskData)srcTask).CusDuration;
        CusActualHour = ((CustomTaskData)srcTask).CusActualHour;
        VendorID = ((CustomTaskData)srcTask).VendorID;
        Vendor = ((CustomTaskData)srcTask).Vendor;
        RootVendorID = ((CustomTaskData)srcTask).RootVendorID;
        RootVendorName = ((CustomTaskData)srcTask).RootVendorName;
        ProjectName = ((CustomTaskData)srcTask).ProjectName;
        PlannerTaskID = ((CustomTaskData)srcTask).PlannerTaskID;
        ItemRefID = ((CustomTaskData)srcTask).ItemRefID;
        Dependency = ((CustomTaskData)srcTask).Dependency;
    }

    public override void CopyTo(ITask destTask)
    {
        base.CopyTo(destTask);

        ((CustomTaskData)destTask).Description = Description;
        ((CustomTaskData)destTask).ProjectID = ProjectID;
        ((CustomTaskData)destTask).PlannerID = PlannerID;
        ((CustomTaskData)destTask).CusTaskType = CusTaskType;
        ((CustomTaskData)destTask).CusDuration = CusDuration;
        ((CustomTaskData)destTask).CusActualHour = CusActualHour;
        ((CustomTaskData)destTask).VendorID = VendorID;
        ((CustomTaskData)destTask).Vendor = Vendor;
        ((CustomTaskData)destTask).RootVendorID = RootVendorID;
        ((CustomTaskData)destTask).RootVendorName = RootVendorName;
        ((CustomTaskData)destTask).ProjectName = ProjectName;
        ((CustomTaskData)destTask).PlannerTaskID = PlannerTaskID;
        ((CustomTaskData)destTask).ItemRefID = ItemRefID;
        ((CustomTaskData)destTask).Dependency = Dependency;
    }
}
I am facing issue where I am trying to pass the object of GanntProvider class in WebServiceController constructor. It's an .ASMX file.

Kindly help me resolve this.

Thanks
Varun