how can i slove this problem ?

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C#

//Setting the current document guid
string fetch = this.FetchXmlString.Get(executionContext);
fetch = fetch.Replace(
    "value=""",
    "value="" + context.PrimaryEntityId.ToString() + """);

//execute fetch

When I built it, its showing me the following error:

) expected,
; expected

Invalid expression term ')'
Invalid expression term ','

Only assignmen, Call, increment, decrement, and new object expressions can be used as a statement.

can I know what happen actually ?? how can I solve it ??
please help!! thank you!!

The following code is my Full Coding in C#:

namespace xyz.Crm.Workflow
{
    using System;
    using System.Activities;
    using System.Linq;
    using System.ServiceModel;
    using System.Text;
    using Microsoft.Xrm.Sdk;
    using Microsoft.Xrm.Sdk.Client;
    using Microsoft.Xrm.Sdk.Messages;
    using Microsoft.Xrm.Sdk.Metadata;
    using Microsoft.Xrm.Sdk.Query;
    using Microsoft.Xrm.Sdk.Workflow;

    public sealed class DokumentPositionen : CodeActivity
    {
        /// <summary>
        /// Executes the workflow activity.
        /// </summary>
        /// <param name="executionContext">The execution context.</param>
        protected override void Execute(CodeActivityContext executionContext)
        {
            // Create the tracing service
            ITracingService tracingService = executionContext.GetExtension<ITracingService>();

            if (tracingService == null)
            {
                throw new InvalidPluginExecutionException("Failed to retrieve tracing service.");
            }

            tracingService.Trace("Entered DokumentPositionen.Execute(), Activity Instance Id: {0}, Workflow Instance Id: {1}",
                executionContext.ActivityInstanceId,
                executionContext.WorkflowInstanceId);

            // Create the context
            IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();

            if (context == null)
            {
                throw new InvalidPluginExecutionException("Failed to retrieve workflow context.");
            }

            tracingService.Trace("DokumentPositionen.Execute(), Correlation Id: {0}, Initiating User: {1}",
                context.CorrelationId,
                context.InitiatingUserId);

            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
            OrganizationServiceContext orgcontext = new OrganizationServiceContext(service);

            try
            {
                //used to collect headers and values of lines
                StringBuilder sb = new StringBuilder();

                //Setting the current document guid
                string fetch = this.FetchXmlString.Get(executionContext);
                fetch = fetch.Replace(
                    "value=""",
                    "value="" + context.PrimaryEntityId.ToString() + """);

                //execute fetch
                EntityCollection entityCollection = service.RetrieveMultiple(new FetchExpression(fetch));

                if (entityCollection.Entities.Count > 0)
                {
                    RetrieveEntityRequest retrieveEntityRequest = new RetrieveEntityRequest
                    {
                        EntityFilters = EntityFilters.Attributes,
                        LogicalName = entityCollection.EntityName
                    };

                    RetrieveEntityResponse retrieveEntityResponse = (RetrieveEntityResponse)service.Execute(retrieveEntityRequest);

                    if (retrieveEntityResponse.EntityMetadata.Attributes == null)
                        throw new Exception("null Wert für Attribute");

                    if (retrieveEntityResponse.EntityMetadata.Attributes.Count() == 0)
                        throw new Exception("0 Attribute");

                    if (entityCollection.Entities.Count == 0)
                        throw new Exception("0 Datensätze");

                    //setting up headers
                    //fetch contains by default in the last 2 fields currency and parent attribute => no need => cut = -2
                    for (int i = 0; i < entityCollection.Entities[0].Attributes.Count - 2; i++)
                    {
                        tracingService.Trace("Suche Attribute mit : {0}", entityCollection.Entities[0].Attributes.ElementAt(i).Key);
                        AttributeMetadata am = retrieveEntityResponse.EntityMetadata.Attributes.Where(x => x.LogicalName == entityCollection.Entities[0].Attributes.ElementAt(i).Key).FirstOrDefault();

                        if (am != null && String.IsNullOrEmpty(am.DisplayName.ToString()) == false)
                        {
                            sb.Append(am.DisplayName.LocalizedLabels.First().Label + " ");
                        }
                    }

                    //collecting line values
                    foreach (var entity in entityCollection.Entities)
                    {
                        sb.AppendLine();

                        //fetch contains by default in the last 2 fields currency and parent attribute => no need => cut = -2
                        for (int i = 0; i < entity.Attributes.Count - 2; i++)
                        {
                            if (entity.Attributes.ElementAt(i).Value is EntityReference)
                            {
                                tracingService.Trace("Attribute wird übersprungen weil Referenz");
                            }
                            else if (entity.Attributes.ElementAt(i).Value is Money)
                            {
                                sb.Append(((Money)entity.Attributes.ElementAt(i).Value).Value.ToString("0.00") + " ");
                            }
                            else if (entity.Attributes.ElementAt(i).Value is Decimal)
                            {
                                sb.Append(((Decimal)entity.Attributes.ElementAt(i).Value).ToString("0.00") + " ");
                            }
                            else
                                sb.Append(entity.Attributes.ElementAt(i).Value.ToString() + " ");

                            // if more types...
                            //http://community.dynamics.com/product/crm/crmnontechnical/b/c5insightblog/archive/2011/03/04/dynamics-crm-2011-reading-attribute-values-inside-your-plug-in.aspx
                        }
                    }
                }
                else
                {
                    //no line in the document
                    sb.AppendLine("Keine Belegpositionen vorhanden");
                }

                this.DokumentPositionenString.Set(executionContext, sb.ToString());
            }
            catch (FaultException<OrganizationServiceFault> e)
            {
                tracingService.Trace("Exception: {0}", e.ToString());

                // Handle the exception.
                throw;
            }

            tracingService.Trace("Exiting DokumentPositionen.Execute(), Correlation Id: {0}", context.CorrelationId);
        }

        [Output("String with Positions")]
        [Default("")]
        public OutArgument<string> DokumentPositionenString { get; set; }

        [RequiredArgument]
        [Input("FetchXML")]
        public InArgument<string> FetchXmlString { get; set; }
    }
}

this is a Custom Workflow in MS CRM 2011
thank you!!