C# 将数据绑定到网格视图不起作用

在下面的代码中，我在一个会话中得到了2个变量，我试图通过传递客户端id绑定自定义控件中的值，在另一种情况下，我试图通过传递doumnet id将另一个值绑定到grid view。但是自定义控件绑定成功，但grid view无法绑定，因此抛出错误。请帮助我解决此问题

 var SearchDoc = (SearchDoc)Session["Documentname"];
                var oDocumentID = SearchDoc.ClientID;
               string odoc = SearchDoc.DocumentID.ToString();
                DocumentServiceClient Doc = new DocumentServiceClient();
                DataSet dsField = Doc.GetClientFields(oDocumentID);
                DataTable dtDocument = Doc.GetDocumentsByDocumentID(odoc).Tables[0];
                gmaFieldsContr.dtFieldsInfo = dsField.Tables[0];
                gmaFieldsContr.BindData();
                Attchdwnld.DataSource = dtDocument; 
                Attchdwnld.DataBind();

页面加载：

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                var SearchDoc = (SearchDoc)Session["Documentname"];
                var oDocumentID = SearchDoc.ClientID;
                var odoc = SearchDoc.DocumentID;
                DocumentServiceClient Doc = new DocumentServiceClient();
                DataSet dsField = Doc.GetClientFields(oDocumentID);
                DataSet dsField1 = Doc.GetDocumentsByDocumentID(odoc);//
                gmaFieldsContr.dtFieldsInfo = dsField.Tables[0];
                gmaFieldsContr.BindData();
                Attchdwnld.DataSource = dsField1.Tables[0];
                Attchdwnld.DataBind();}}

我来解决这个问题

 var SearchDoc = (SearchDoc)Session["Documentname"];
                var oDocumentID = SearchDoc.ClientID;
               string odoc = SearchDoc.DocumentID.ToString();
                DocumentServiceClient Doc = new DocumentServiceClient();
                DataSet dsField = Doc.GetClientFields(oDocumentID);
                DataTable dtDocument = Doc.GetDocumentsByDocumentID(odoc).Tables[0];
                gmaFieldsContr.dtFieldsInfo = dsField.Tables[0];
                gmaFieldsContr.BindData();
                Attchdwnld.DataSource = dtDocument; 
                Attchdwnld.DataBind();

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请始终提供足够的有问题的数据，以便其他人能够轻松理解并帮助解决查询。请给出您面临的错误。@Sunil Devre@serhads问题已解决dtDocument=Doc.GetDocumentsByDocumentIDodoc.Tables[0]；。。。您没有选择表[0]，因此面临错误，对吗？我将var更改为string，现在值已绑定