conversion from string to integer is not valid

Question

1.00/5 (1 vote)

See more:

i m still new in vb.net, i have a small problem here during conversion from string to type integer.

i trying loop inside the datagridview, if the system found the data with string "Record Not Found" its will display in yellow color inside the datagridview.
but, when i run my project, error will popup with "conversion from string "Record Not Found" to type integer is not valid.
this is my code,

Dim str As String = "Record Not Found"
For j As Integer = 0 To DGatt.Rows.Count - 1
If DGatt.Rows(j).Cells(0).Value = CType(str, Integer) Then
DGatt.Rows(j).Cells(0).Style.ForeColor = Color.Yellow
End If
Next

how can i settle this problem, i've try using others function but its didnt work at all.
thanks for helping me,

Posted 19-Apr-13 18:46pm

JOE Heart Under Blade

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-04-19T19:05:00

What do you want really? To have the string "Record Not Found" "converted" to integer? With the value -1 or, perhaps, 666? :-)
You explicitly assigned this value to a string in first line, why? you never use it.

First of all, if you want to store integer in some cell, store integer, not a string. Use the cell type derived from System.Windows.Forms.DataGridViewCell to store Integer and not anything else. If you need to edit this value in place, use System.Windows.Forms.DataGridViewTextBoxCell:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcell.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewtextboxcell.aspx[^].

In all cases, before type-casting the cell Value, check the value type:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewtextboxcell.aspx[^].

And, finally, if you have a string which you need to parse as integer but nut sure it is always successful (as in the case with DataGridViewTextBoxCell, see above), don't use VB-specific CType, use civilized and explicitly named System.Int32.Parse (will throw exception if parsing is not successful) or System.Int32.TryParse; see also the parsing method with the same names for all other numeric types.

—SA