Grid view values not displaying in web Page

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ASP

ASP.NET

Every thing seems correct but blank in web page. not showing Grid view values

public partial class Treatments : System.Web.UI.Page
{
    string sqlstr;
    SqlDataReader dr;
    SqlCommand cmd = new SqlCommand();
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());


    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            FillGrid();
        }
    }

    public void FillGrid()
    {

        sqlstr = "select TID,Title,Description,Date,ImagePath from Treatments";
        DataTable dt = new DataTable();
        dt = DAL.getData(sqlstr);
        if (dt.Rows.Count > 0)
        {
            Grdtreatments.DataSource = dt;
            Grdtreatments.DataBind();
        }

    }

<asp:GridView ID="Grdtreatments" runat="server" AutoGenerateColumns="False" OnRowCommand="Grdtreatments_RowCommand"
            CssClass="Grid" AllowPaging="True" AlternatingRowStyle-CssClass="alt" PagerStyle-CssClass="pgr"
            Width="100%">
            <HeaderStyle BackColor="#993333" CssClass="dgHeaderStyle" Font-Bold="True" Font-Italic="False"
                Font-Overline="False" Font-Size="Medium" Font-Strikeout="False" Font-Underline="False" />
            <AlternatingRowStyle CssClass="alt"></AlternatingRowStyle>
            <Columns>
                <asp:TemplateField HeaderText="Treatments ID">
                    <ItemTemplate>
                        <asp:Label ID="TID" runat="server" Text='<%# Eval("TID") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Title">
                    <ItemTemplate>
                        <asp:Label ID="Title" runat="server" Text='<%# Eval("Title") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Description">
                    <ItemTemplate>
                        <asp:Label ID="Description" runat="server" Text='<%# Eval("Description") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkView" runat="server" CommandName="Select" Text="View" OnClick="LinkView_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:HyperLink ID="HyperLinkEdit" runat="server" NavigateUrl='<%#"TreatmentsDetails.aspx?ID="+Eval("TID")%>'
                            Target="_blank" Text="Edit"></asp:HyperLink>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="HyperLinkDelete" runat="server" Text="Delete" CommandArgument='<%# Eval("TID") %>'
                            CommandName="Vdelete" OnClientClick="return ConfirmOnDelete('');" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <PagerStyle CssClass="pgr"></PagerStyle>
        </asp:GridView>

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public class DAL
{
public static SqlConnection getSqlConnection()
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ConnectionString);
return conn;
}
public static DataTable getData(string Query)
{
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(Query, getSqlConnection());
da.Fill(dt);
return dt;
}