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If the value of a cell is not valid I'd like to warn the user with a message box and pressing This issue is explained in the following MSDN forums post: Data Grid View Row Validating = Index 4 does not have a value?Basically it appears to be a bug (or at least very unexpected behaviour) in the way the Data Grid View handles validation - the Message Box.Cancel is also set to TRUE because that value is required.i repeat the previous scenario and when i get back to that cell, i find it EMPTY, not even having its old value...In this current situation, there is only one column. If he enters some unique value in there, the row gets validated and all works well.

winforms datagridview rowvalidating-54

EDIT: here is my validating methods: Here is how it looks when it happens, if I hit Escape key, the error message disappears, but when I try to click something else, Row Validation happens again and I back to this state: EDIT2: I use datatable as datasource for this datagridview.

Canceling this event prevents the user from exiting the cell until a valid value is entered or the edit process is canceled (via Esc key).

The Data Bound Item will be updated only if the cell is validated.

I'd like to obtain something similar to MS Mangement Studio: if the mandatory cell in the current row is not filled i could not add another row. const int Mandatory Column Index = 1; public Form1() private void data Grid View1_Row Validating(object sender, Data Grid View Cell Cancel Event Args e) private void data Grid View1_Cell Validating(object sender, Data Grid View Cell Validating Event Args e) I'm trying your piece of code, but there's something wrong: if I edit the mandatory cell it works, but if I only fill the other cells, leaving the mandatory empty, I can add all the rows that I want.

another case: if i delete cell's value instead of inserting an invalid value, e.




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