paging in repeater , keeping data

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C#

repeater

i have repeater which use to add data into database
i am using paging in this repeater and work well
when i am select other page data in other pages clear
i am trying to use view stat to keep data after rebind repeater but there is error
here is my code

<asp:Repeater ID="Repeater1" runat="server">
      <HeaderTemplate>
            <div class="form-group" >
              <div class="col-sm-2 control-label">
                  English
                  </div>
           <center>   <div class="col-sm-2 control-label">
              Other Language
                  </div>
               </center>
                </div>
      </HeaderTemplate>
        <ItemTemplate>
          
               <div class="form-group" >
             
                   <div class="col-sm-2 control-label">  <%# Eval("EnglishTranslation")%><asp:Label ID="Label1" runat="server" Text=' <%# Eval("StaticTRanslationId")%>' Visible="false"></asp:Label> </div>
            <div class="col-sm-10">    <input id="Text1" type="text" class="form-control"  runat="server" /></div>
                 
               
        
           
            </div>
        </ItemTemplate>
   

    </asp:Repeater>

and in CS coding in Page Load

List<tblstaticTranslation> list = new List<tblstaticTranslation>();
ReturnDbForTesEntities db = new ReturnDbForTesEntities();
protected void Page_Load(object sender, EventArgs e)
{

    list = db.tblstaticTranslation.Where(p => p.LanguageId == 1).ToList();
    if (!IsPostBack)
    {
        GetItems();
        retrivedata();
    }

}

public int CurrentPage
{
    get
    {
        //get current page number
        object obj = this.ViewState["_CurrentPage"];
        if (obj == null)
        {
            return 0;
        }
        else
        {
            return (int)obj;
        }
    }
    set
    {
        //set in viewstate the current page number
        this.ViewState["_CurrentPage"] = value;
    }
}
private int GetItems()
{
    //create new instance of PagedDataSource
    PagedDataSource objPds = new PagedDataSource();
    //set number of pages will appear
    Ods = list;
    objPds.PageSize = 10;
    objPds.DataSource = Ods.ToList(); ;
    objPds.AllowPaging = true;
    int count = objPds.PageCount;
    objPds.CurrentPageIndex = CurrentPage;
    if (objPds.Count > 0)
    {
        //dispaly controls if there are pages
        btnPrevious.Visible = true;
        btnNext.Visible = true;
        btnLastRecord.Visible = true;
        btnFirstRecord.Visible = true;
        lblCurrentPage.Visible = true;
        lblCurrentPage.Text = "Page " +
          Convert.ToString(CurrentPage + 1) + " of " +
          Convert.ToString(objPds.PageCount);
    }
    else
    {
        //disable controls if there are no pages
        btnPrevious.Visible = false;
        btnNext.Visible = false;
        btnLastRecord.Visible = false;
        btnFirstRecord.Visible = false;
        lblCurrentPage.Visible = false;
    }
    btnPrevious.Enabled = !objPds.IsFirstPage;
    btnNext.Enabled = !objPds.IsLastPage;
    btnLastRecord.Enabled = !objPds.IsLastPage;
    btnFirstRecord.Enabled = !objPds.IsFirstPage;

    Repeater1.DataSource = objPds;
    Repeater1.DataBind();
    //}
    return count;
}
/// <summary>
/// set or get ObjectDataSource that's use to bind the control
/// Like(Repeater or Datalist)
/// </summary>
public List<tblstaticTranslation> Ods { get; set; }

void getdata()
{
    List<tblstaticTranslation> liststatic = new List<tblstaticTranslation>();
    tblstaticTranslation tbstatic = new tblstaticTranslation();
    foreach (RepeaterItem item in Repeater1.Items)
    {

        string x = ((Label)item.FindControl("Label1")).Text;
        HtmlInputText y = ((HtmlInputText)item.FindControl("Text1"));

        if (y.Value .Trim() != string.Empty)
        {
            tbstatic.StaticTRanslationId = Convert.ToInt32(x);
            tbstatic.OtherLanguageTranslation = y.Value ;
            if (liststatic.Where(p => p.StaticTRanslationId == tbstatic.StaticTRanslationId).FirstOrDefault() == null)
            {
                liststatic.Add(tbstatic);
            }
            else
            {

                liststatic.Remove(liststatic.Where(p => p.StaticTRanslationId == tbstatic.StaticTRanslationId).FirstOrDefault());
                liststatic.Add(tbstatic);
            }
            tbstatic = new tblstaticTranslation();
        }
    }
    var dt = ConvertToDatatable(liststatic);
    ViewState.Add("data", dt);

}
void retrivedata()
{
    //  List<tblstaticTranslation> data = new List<tblstaticTranslation>();
    tblstaticTranslation[] newArrayname = (tblstaticTranslation[])ViewState["data"];

    List<tblstaticTranslation> data = new List<tblstaticTranslation>();
    if (newArrayname != null)
    {
        data = new List<tblstaticTranslation>(newArrayname);
    }

    DataTable dt = (DataTable)ViewState["data"];
    DataView dataView = new DataView(dt.Select);

    foreach (RepeaterItem items in Repeater1.Items)
    {
        string x = ((Label)items.FindControl("Label1")).Text;
        HtmlInputText y = ((HtmlInputText)items.FindControl("Text1"));
        int id = Convert.ToInt32(x);
        if (dt.Select("StaticTRanslationId=" + id) != null)
        {
            y.Value = data.Where(p => p.StaticTRanslationId == id).FirstOrDefault().OtherLanguageTranslation;
        }

    }



}
/// <summary>
/// set or get Control Name EX. (Repeater1 or Datalist1)
/// </summary>
public object ObjectControl { get; set; }

/// <summary>
/// set or get count of pages
/// page size determine how many records will appears in every page
/// </summary>
public int PageSize { get; set; }
protected void btnnext2_Click(object sender, EventArgs e)
{

    //  MultiView1.SetActiveView(View3);

}
private static DataTable ConvertToDatatable<T>(List<T> data)
{
    PropertyDescriptorCollection props =
        TypeDescriptor.GetProperties(typeof(T));
    DataTable table = new DataTable();
    for (int i = 0; i < props.Count; i++)
    {
        PropertyDescriptor prop = props[i];
        if (prop.PropertyType.IsGenericType && prop.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
            table.Columns.Add(prop.Name, prop.PropertyType.GetGenericArguments()[0]);
        else
            table.Columns.Add(prop.Name, prop.PropertyType);
    }
    object[] values = new object[props.Count];
    foreach (T item in data)
    {
        for (int i = 0; i < values.Length; i++)
        {
            values[i] = props[i].GetValue(item);
        }
        table.Rows.Add(values);
    }
    return table;
}


protected void btnFirstRecord_Click(object sender, EventArgs e)
{
    CurrentPage = 0;

     if (ViewState["data"] != null)
     {

         getdata();
     //    retrivedata();
     }
     else
     {
      //   retrivedata();
         getdata();

     }
     GetItems();
}

protected void btnLastRecord_Click(object sender, EventArgs e)
{
    CurrentPage = GetItems() - 1;


    if (ViewState["data"] != null)
    {

        getdata();
     //   retrivedata();
    }
    else
    {
     //   retrivedata();
        getdata();

    }
    GetItems();
}

protected void btnPrevious_Click1(object sender, EventArgs e)
{
    CurrentPage -= 1;


    if (ViewState["data"] != null)
    {

        getdata();
    //    retrivedata();
    }
    else
    {
       // retrivedata();
        getdata();

    }
    GetItems();
}

protected void btnNext_Click(object sender, EventArgs e)
{
    CurrentPage += 1;


    if (ViewState["data"] != null)
    {

        getdata();
     //   retrivedata();
    }
    else
    {
        getdata();
   //     retrivedata();


    }
    GetItems();
}