Asp button is not firing

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C#2.0

C#

ASP.NET

CSS

HTML

jQuery

hi friends

i have a adminlogin page inside a admin folder not in root directory

in adminlogin.aspx page there is login form ( NOT LOGIN TOOLBOX) there a button called Signin if i click the signin button am getting a error:

ERROR : Incorrect Syntax near','.

the even is not firing in button
pleas help me
should i need two webconfig file inside admin folder?


my login Button Code
thin LoginButton is in admin folder not in root directory the page is login.aspx

protected void btnLog_Click(object sender, EventArgs e)
    {
        String constr = ConfigurationManager.ConnectionStrings["MyProject"].ConnectionString;
        SqlConnection con = new SqlConnection(constr);
        con.Open();

        string sql;
        sql = "SELECT UserName,Password from tblLogin where UserName= '" + txtU.Text + "', Password ='" + txtP.Text + "'";
        SqlCommand cmd = new SqlCommand(sql,con);
        
        cmd.Parameters.AddWithValue("@UserName", txtU.Text);
        cmd.Parameters.AddWithValue("@Password", txtP.Text);

        SqlDataAdapter da = new SqlDataAdapter(cmd);

        DataTable dt = new DataTable();
        //Session.Timeout = 60;
        da.Fill(dt);

        if (dt.Rows.Count > 0)
        {
            Response.Redirect("~/admin/MainPage.aspx");
        }
        else
        {
            Response.Write("Login failed");
        }
      

    }