C# ta Textbox tan veri çekiyorum fakat database de düzenleyemiyorum

  protected void Page_Load(object sender, EventArgs e) 
          { 
   
              bool loggedin = Convert.ToBoolean(Session["LoggedIn"]); 
              if (loggedin == false) 
              { 
                  Response.Redirect("../Redirect.aspx"); 
              } 
   
              int access = Convert.ToInt32(Session["AccessID"]); 
              if (access == 1) 
              { 
                  Response.Redirect("../Redirect.aspx"); 
              } 
   
              if (access == 2) 
              { 
                  Response.Redirect("../Redirect.aspx"); 
              } 
              int x = Convert.ToInt32(Request.QueryString["id"]); 
              SqlConnection conn = new SqlConnection(); 
              conn.ConnectionString = "Server=(local);Database=TRY;Trusted_Connection=True;"; 
              conn.Open(); 
              SqlCommand com = new SqlCommand("select * From Users Where Id = " + x.ToString(), conn); 
              SqlDataReader reader = com.ExecuteReader(); 
              if (reader.Read()) 
              { 
                  TxtUsr.Text = reader["Username"].ToString(); 
                  TxtPass.Text = reader["Password"].ToString(); 
                  TxtEmail.Text = reader["Email"].ToString(); 
             } 
              } 
   
          protected void Button1_Click(object sender, EventArgs e) 
          { 
              int x = System.Convert.ToInt32(Request.QueryString["id"]); 
              SqlConnection conn = new SqlConnection(); 
              conn.ConnectionString = "Server=(local);Database=TRY;Trusted_Connection=True;"; 
              conn.Open(); 
              SqlCommand com = new SqlCommand("select * from Users", conn); 
              SqlDataReader reader = com.ExecuteReader(); 
   
                   
                  com.CommandText = "UPDATE USERS SET Username = '" + TxtUsr.Text + "' Where Id = '" + x.ToString() + "'"; 
                  reader.Close(); 
                  com.ExecuteNonQuery(); 
                  com.CommandText = "UPDATE USERS SET Password = '" + TxtPass.Text + "' Where Id = '" + x.ToString() + "'"; 
                  com.ExecuteNonQuery(); 
                  com.CommandText = "UPDATE USERS SET Email = '" + TxtEmail.Text + "' Where Id = '" + x.ToString() + "'"; 
                  com.ExecuteNonQuery(); 
                      
   
   
                  if ( passive.Enabled ) 
                  {  
                   
                      com.CommandText = "UPDATE USERS SET AccessID = '" + "1" + "' Where Id = '" + x.ToString() + "'"; 
                      com.ExecuteNonQuery(); 
                   
                  } 
   
              if (active.Enabled) 
                  {  
                   
                      com.CommandText = "UPDATE USERS SET AccessID = '" + "2" + "' Where Id = '" + x.ToString() + "'"; 
                      com.ExecuteNonQuery(); 
                   
                  } 
   
              if (adminrad.Enabled) 
                  { 
   
                      com.CommandText = "UPDATE USERS SET AccessID = '" + "3" + "' Where Id = '" + x.ToString() + "'"; 
                      com.ExecuteNonQuery(); 
                   
                  } 
   
              Response.Redirect("users.aspx"); 
    
          }