retrieve the document in sharepoint library when retrieving other data it has to retrieve the document also and how to search inside the document

using Microsoft.SharePoint.Client; using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; using System.Net; using Microsoft.SharePoint;

using Microsoft.IdentityModel.S2S.Tokens; using ClientOM = Microsoft.SharePoint.Client; using System.Text; using candidate_profileWeb.Pages;

namespace candidate_profileWeb { public partial class Default : System.Web.UI.Page {

    SharePointContextToken contextToken;
    string accessToken;
    Uri sharepointUrl;
    protected void Page_Load(object sender, EventArgs e)
    {

        string contextTokenString = TokenHelper.GetContextTokenFromRequest(Request);
        if (contextTokenString != null)
        {
            contextToken =
                TokenHelper.ReadAndValidateContextToken(contextTokenString, Request.Url.Authority);
            sharepointUrl = new Uri(Request.QueryString["SPHostUrl"]);
            accessToken =
                TokenHelper.GetAccessToken(contextToken, sharepointUrl.Authority).AccessToken;


            Submit.CommandArgument = accessToken;
            retrive.CommandArgument = accessToken;

        }
        if (IsPostBack)
        {
            sharepointUrl = new Uri(Request.QueryString["SPHostUrl"]);
        }

        //Execute a request to add a list that has the user-supplied name.
    }


    protected void Submit_Click(object sender, EventArgs e)
    {
        var accesssToken = ((Button)sender).CommandArgument;

        if (IsPostBack)
        {
            sharepointUrl = new Uri(Request.QueryString["SPHostUrl"]);
        }

        //Execute a request to add a list that has the user-supplied name.
        ClientContext clientContext = TokenHelper.GetClientContextWithAccessToken(sharepointUrl.ToString(), accesssToken);
        Web web = clientContext.Web;
        ListCollection lists = web.Lists;
        List List = clientContext.Web.Lists.GetByTitle("list name");
         clientContext.Load(List);

         DateTime dt = DateTime.Today;

        ListItemCreationInformation listCreationInformation = new ListItemCreationInformation();


        List documentsList = clientContext.Web.Lists.GetByTitle("list name");

        var fileCreationInformation = new FileCreationInformation();
        byte[] documentstream = System.IO.File.ReadAllBytes(browse.PostedFile.FileName);
        fileCreationInformation.Content = documentstream;
        fileCreationInformation.Url = browse.PostedFile.FileName;
        fileCreationInformation.Overwrite = true;
        Microsoft.SharePoint.Client.File uploadFile = documentsList.RootFolder.Files.Add(
           fileCreationInformation);



        uploadFile.ListItemAllFields["cname"] = cname.Text;
        uploadFile.ListItemAllFields["qualification"] = qualification.Text;
        uploadFile.ListItemAllFields["gender"] = gender.Text;
        uploadFile.ListItemAllFields["address"] = address.Text;
        uploadFile.ListItemAllFields["posting"] = posting.Text;
        uploadFile.ListItemAllFields["domain"] = domain.Text;
        uploadFile.ListItemAllFields["experience"] = experience.Text;
        uploadFile.ListItemAllFields["salary"] = salary.Text;



        uploadFile.ListItemAllFields.Update();
        clientContext.Load(documentsList);
        clientContext.ExecuteQuery();


        try
        {
            clientContext.ExecuteQuery();
        }
        catch (Exception j)
        {
            Label2.Text = j.Message;


        }
    }





    protected void retrive_Click(object sender, EventArgs e)
    {
        var accesssToken = ((Button)sender).CommandArgument;
        if (IsPostBack)
        {
            sharepointUrl = new Uri(Request.QueryString["SPHostUrl"]);
        }


        ClientContext clientContext = TokenHelper.GetClientContextWithAccessToken(sharepointUrl.ToString(), accesssToken);
        Web web = clientContext.Web;
        ListCollection lists = web.Lists;
        List List = clientContext.Web.Lists.GetByTitle("list name");
        clientContext.Load(List);

        CamlQuery camlQuery = new CamlQuery();
        camlQuery.ViewXml = "<View><Query><Where><Eq>" +
             "<FieldRef Name ='qualification'/> <Value Type ='Text'>" + TextBox1.Text + "</Value>" +

             "</Eq></Where></Query></View>";

//{ "here i have to use [AND] command to retrieve another value both same it has to retrieve " }

        Microsoft.SharePoint.Client.ListItemCollection items = List.GetItems(camlQuery);
        clientContext.Load(items);
        try
        {
            clientContext.ExecuteQuery();
        }
        catch (Exception er)
        {
            Label1.Text = er.Message;
        }

        foreach (Microsoft.SharePoint.Client.ListItem item in items)
        {



            TableRow tablerow = new TableRow();
            TableCell tablecell1 = new TableCell();
            TableCell tablecell2 = new TableCell();
            TableCell tablecell3 = new TableCell();
            TableCell tablecell4 = new TableCell();
            TableCell tablecell5 = new TableCell();
            TableCell tablecell6 = new TableCell();
            TableCell tablecell7 = new TableCell();
            TableCell tablecell8 = new TableCell();
            TableCell tablecell9 = new TableCell();

            tablecell1.Text = item.FieldValues["cname"].ToString();
            tablecell2.Text = item.FieldValues["qualification"].ToString();
            tablecell3.Text = item.FieldValues["gender"].ToString();
            tablecell4.Text = item.FieldValues["address"].ToString();
            tablecell5.Text = item.FieldValues["posting"].ToString();
            tablecell6.Text = item.FieldValues["domain"].ToString();
            tablecell7.Text = item.FieldValues["experience"].ToString();
            tablecell8.Text = item.FieldValues["salary"].ToString();


          tablerow.Cells.Add(tablecell1);
                tablerow.Cells.Add(tablecell2);
                tablerow.Cells.Add(tablecell3);
                tablerow.Cells.Add(tablecell4);
                tablerow.Cells.Add(tablecell5);
                tablerow.Cells.Add(tablecell6);
                tablerow.Cells.Add(tablecell7);
                tablerow.Cells.Add(tablecell8);
                tablerow.Cells.Add(tablecell9);
                ListTable.Rows.Add(tablerow);

            }
        }

    }
}

I am created document library in sharepoint online and i uploaded data successfully but i have a problem when i am retrieving the ["qualification = TextBox1.Text"] i has to display what all qualification same in the library . It displaying all the data but "document is not retrieved"

And how to search inside the document data using client side program

what i have to do please help me