one dataGrid with 3 search option - asp.net

Question

My scenario is : I have one dataGrid with 5-6 columns. i have 3 filters which use 3 SQL queries methods in codeBehind :SearchByName(), SearchByValue() , SearchByDate().I have fourth method show DefaultShow() which display all data without any filters.
Basicly I want when Page is loaded DefaultShow() method to load and then user can choose option for search with RadioButtonList
DefaultShow() code is :
public void DefaultShow()
{
string connectionString = cs.getConnection();
string query = "select Id ,name,value,Description,DateCreate from AllCostView where IdUser = '" + cui.getCurrentId() + "'";
using (SqlConnection myConnection = new SqlConnection(connectionString))
{
myConnection.Open();
SqlCommand command = new SqlCommand(query, myConnection);
SqlDataAdapter mySqlAdapter = new SqlDataAdapter(command);
using (DataTable myDataTable = new DataTable())
{
mySqlAdapter.Fill(myDataTable);
GridViewCost.DataSource = myDataTable;
GridViewCost.DataBind();
}
}
}
protected void Page_Load(object sender, EventArgs e)
{
DefaultShow();
}
But this not work what am I miss?
My gridViewCode is this :
<div class ="gridView">
<asp:GridView ID="GridViewCost" runat="server" AutoGenerateColumns="False" CaptionAlign="Top"
ShowFooter="True" ShowHeaderWhenEmpty="True" Font-Overline="False"
Font-Strikeout="False" Font-Underline="False"
AllowPaging="true"
PageSize="5"
CssClass="mGrid"
PagerStyle-CssClass="pgr"
AlternatingRowStyle-CssClass="alt" OnPageIndexChanging="GridViewCost_PageIndexChanging" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged" >
<AlternatingRowStyle CssClass="alt"></AlternatingRowStyle>
<Columns>
<asp:BoundField DataField="Id" HeaderText="Номер" />
<asp:TemplateField HeaderText="Име">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
</ItemTemplate>
<ControlStyle Width="100px" />
</asp:TemplateField>
<asp:BoundField DataField="Value" HeaderText="Стойност" />
<asp:BoundField DataField="Description" HeaderText="Описание" />
<asp:BoundField DataField="DateCreate" HeaderText="Дата" />
</Columns>
<AlternatingRowStyle />
<HeaderStyle HorizontalAlign="Right"/>
<PagerStyle />
<RowStyle BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" HorizontalAlign="Center" />
</asp:GridView>
If it's needed i will post more code . Thanks.