Byte Conversion

spankyleo123

Hi ppl, I have a table with two column ID (tinyint) and TEXT (varchar). I am using this table to populate the droplist on my windows form. when i select items from the droplist I am getting this error "ByteConverter cannot convert from System.Int32." NotSupportedException was unhandled. I am populating the selected ID of the droplist into the main table. Pls help. thanks,

realJSOP

show us the code that's handling the selection of the droplist item...

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spankyleo123

combobox.datasource = data.tbtest;
combobox.DisplayMember = "Text";
comboBox.ValueMember = "ID";

This code populates the combobox droplist. and the user selects the appropriate value and the selectedvalue ID gets stored into the Form Table on Button click. Just to add on (on Button Click)

table.TestID = Convert.ToByte(comboBox.Selectedvalue)

I hope this makes sense.

The Man from U N C L E

I'm not clear why you are converting it to a byte, however ... SelectedValue is of type Object and so you will be calling the Convert.ToByte overload that takes Object, which MUST implement IConvertible. Int32 does not implement this interface. The solution is to force it to an int first . e.g.

table.TestID = Convert.ToByte((int)comboBox.Selectedvalue)

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Lost User

Are you sure? http://msdn.microsoft.com/en-us/library/system.int32.aspx[^] Also, int and System.Int32 are just two different way of writing the same thing

spankyleo123

Sorry mate. By CType do u mean Conversion.ChangeType in C#? Could you provide the same in C# please. I am converting it to Byte because the column in of type tinyint (8 bit integer = 1 byte) Thanks,

spankyleo123

Thanks for the answer. When i select an item from the combobox and tab to the next control... its giving me the same exception. Do I have to change any property of the combobox? Cheers!!

Saksida Bojan

spankyleo123 wrote:

. When i select an item from the combobox and tab to the next control... its giving me the same exception

What excepiton? Where it does happen, and in witch event?

spankyleo123

Its this one ... "ByteConverter cannot convert from System.Int32." NotSupportedException was unhandled. This happens when i select a combobox item and go to next control on the form. Many thanks,

Lost User

This thread seems to be getting lost. Try stepping through the code in the debugger (put a breakpoint where the exception occurs), and capture all values. Then post those values, the exception, and the code around the exception, so people can see everything that is involved with the problem in one message.

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The Man from U N C L E

Thanks, I stand corrected. I checked as far as it is a structure and missed the interface declaration.

If you have knowledge, let others light their candles at it. Margaret Fuller (1810 - 1850) [My Articles] [My Website]