When To Check If Something Is Nothing? How To Check An Empty Textbox
Oct 15, 2010
I currently do something like...
[Code]....
Now I know this works.. but what is the right way to have this? I don't want to be checking something twice instead of just having it written out once.
I have an array of a server control type, and what I would like to do is check if there any elements set inside the array. How can you check inside if for instance an array has no elements set inside or the array is empty or only one or two?
I make SqlDataSource1.DataBind(); with some parameters on button click,
then I'm working with a Grid onDataBound();
but if my SqlDataSource1 returns empty data I've got an error even if I'm trying to check if (GridView2.HeaderRow.Cells.Count != 0) so I guess I need to check it on SqlDataSource1 someway.
How can i check if dataset is emty some thing like follows
if dataset=emty then msgbox("NO table") else .... End if I am importing excel files from root folder, when file not there then message should apeear to avoid collapsing application.
Code: ry Dim strExcelConn As String = System.Configuration.ConfigurationManager.ConnectionStrings.Item("ExcelConnection1").ToString() Dim dbConn As New OleDbConnection(strExcelConn) Dim strSQL As String
I am using ASP.NET and VB to display a message(label) while the datalist is empty like this <asp:Label ID="lblEmpty" Text="No Data To Display" runat="server" Visible='<%#bool.Parse((dlErgebnis.Items.Count==0).ToString()) %>'></asp:Label>
I am getting a error "the name bool is not declared".
I have set the value of an int parameter to the attribute of a textbox.The textbox can be empty or null, how to check whether the parameter is empty or null?
i'm trying to check for an empty cell in a gridview.
On the RowDataBound event I tried the following:
- if (String.IsNullOrEmpty(e.Row.Cells[2].Text.Trim()))
- if (String.IsNullOrEmpty(e.Row.Cells[2].Text))
- if (e.Row.Cells[2].Text == "")
None of them worked.
I'm using boundfields. I can't use a TemplateField with a label because I need to check for other stuff for that column in the RowDataBound event by doing e.Row.Cells[2].Text - that only works if I use boundfields.
How do I check if my value is empty AND Isnull? I need to check for both, using ISNULL is not enough because the data can change just so that it is empty.
I'm fetching som data from AD and I notice that I'm getting an exeption and notice that one of the users field that I'm fetching is empty, how can I prevent exeption.
What is the proper way to check for null or empty strings on dynamic objects? This is the only solution I've found so far:
if (admin.PasswordHash.GetType() == typeof(DBNull) || admin.PasswordHash == string.Empty)
If the field is null, the object returned is DBNull.Value, but if the field is empty string, it's return as a System.String object. This makes it impossible to do regular "admin.PasswordHash == DBNull.Value" check, as that will fail whenever the field has been set to empty string. Is my example the right (and only) way to go?
this is my sql query and its work fine in my code but it only check ParentDeptID IS NULL it not working when ParentDeptID field is empty how can i check it
("select DeptID,DeptName,(select count(*) FROM HrDept " _ & "WHERE ParentDeptID=sc.DeptID) childnodecount FROM HrDept sc where ParentDeptID IS NULL ", _ objConn)