I created a dataset and added so a datatable with about 18 columns.
I added the datagrid and the data details on the form. Compiler show no errors.
When i run the application i get this strange error that i'm not understanding! Code show no error too, what's wrong with this table?
An unhandled exception of type 'System.ArgumentException' in
System.Windows.Forms.dll
Additional Information: Unable to bind to
property or column Date of DataSource.
Edit: error came out when i add the datatable1 details to the form. datagridview instead give no problem
Please someone could give me tips to avoid this error. I have no idea, i found nothing on google.
screenshot:
Related
enter image description here
Everytime im trying to update data i get this:
Unhandled exception of type 'System.InvalidOperationException' in
WindowsApplication2.exe Additional information: Update requires a
valid UpdateCommand when passing a DataRow collection with changed row
I even recreated table and form in MS visual and nothing happened
Im working on this VB project on visual studio 2013, and when i make changes to a form and try to save it, keep giving me bellow error doesnt even compile or save.
Code generation for property 'DisplayType' failed. Error was: 'The value '0' is not valid value for the enum 'EnumDisplayType'.'
Cant figure out the reason for this.
Fixed the issue.
The problem was with enum as its expecting 0 index.
I experienced this issue while simply trying to rename a button in a MS VS 2017 Windows Forms Application. The error I received was:
Code generation for property 'Protocol' failed. Error was: 'The value '0' is not a valid value for the enum 'ProtocolTypes'.'
As you know, System.Windows.Forms.Button control does not contain a Protocol property. You will need to guess which other object within the application holds that property, and then assign the appropriate value to it.
Right now I'm getting the following:
The conversion of a date data type to a datetime data type resulted in an out-of-range value.
While I can go through and null each parameter to find the issue, this will take hours once the whole sub routine is written. Is there a way to get which parameter is causing the issue?
p.s. This is the line causing the issue. It's simple to fix having found it. It just took a while to find.
SqlCommand.Parameters.Add("#ITIME", SqlDbType.Date).Value = IIf(IsNothing(ITIME), DBNull.Value, ITIME)
What you can do is when the exception is thrown, set a break point on the closing bracket of the catch block. Re-run the program and when the exception is thrown you can hover over and expand your command object. From there expand Parameters and in the right pane of the results view click the little icon to enumerate the results view. This will then allow you to expand the Results View in the left pane. Inside there you will see your parameters where you can check what values each holds at the time of the exception.
OK, hopefully this shows what I'm talking about. I ran short of screen real estate due to the expansions but you can do this through the locals window when the break point hits.
This is on VS2012. I will set this up in 2010 and see if it's different.
I have a datagridviewcomboxcolumn to which I need to load data either from another form or by excel.
Before loading, I am validating the data to make sure it exists in the datagridviewcomboxcolumn list.
Whenever I try to load the data, it gives an exception error as value is not valid.
How can this be solved?
Or
is there a workaround to disable this error?
I'm using VB.NET 2008.
I have an Bound DataGridView with a numeric column that can be edited. However when one selects the number and backspaces there is an error.
If I trap it in DataError Event the error message is "Input String was not in a correct format".
How can I prevent this error?
If you could provide a small sample of your code it might be more helpful, but not having that i'd guess the application is trying to convert the empty string to a number, and it is failing. I'd say your best bet is to put a try/catch in the event that occurs when the data is being updated, and mark it as "handled" (check the EventArgs for a Handled property) to keep the error from being thrown. You'll then need to do your own error checking on the actual save code once the user is done editing the column.
Turns out the problem was that I had changed the DefaultCellStyle.NullValue. I changed it back to the default (Blank) and now everything is fine.