Assigning string value to datagridviewtextboxcolumn gives int32 error

Question

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VB

Trying to assign a string "$57,834" to a DataGridViewTextBoxColumn "Amt":

For Each dgr As DataGridViewRow In dgvExpSubject.Rows
    dgr.Cells("Amt").Value = Format(amt, AG.MASK_DOLLARS)

Gives this error:

    DataGridView Exception: $57,834 is not a valid value for Int32

The Amt column type seems to be Int32. How can I assign string values to this DataGridViewTextBoxColumn?

What I have tried:

Tried stepping through which shows the ValueType as Int32.

Posted 27-Nov-23 9:21am

mmaucher

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Graeme_Grant 27-Nov-23 16:36pm

You are missing code from your question. Click on the green Improve question link and post you column definitions.

2 solutions

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Richard MacCutchan · Answer 1 · 2023-11-27T09:26:00

Solution 1

You have defined that columns an an Int32 type, so you can only assign an integer value to it.

Posted 27-Nov-23 9:26am

Richard MacCutchan

Comments

mmaucher 27-Nov-23 15:36pm

The ColumnType is DataGridViewTextBoxColumn. Where is it picking up Int32?

Richard MacCutchan 27-Nov-23 15:58pm

No idea. Check your code again.

Andre Oosthuizen · Answer 2 · 2023-11-28T06:44:00

The Format function you used in your code in VB is generally used for formatting strings, not for converting data types. you should convert the formatted string to the appropriate data type before assigning it to the cell. Assuming 'Amt' is expected to be a numeric value, you can use 'Decimal.TryParse' to convert the formatted string to a Decimal -

VB

For Each dgr As DataGridViewRow In dgvExpSubject.Rows
    Dim formattedAmt As String = Format(amt, AG.MASK_DOLLARS)
    Dim parsedAmt As Decimal

    If Decimal.TryParse(formattedAmt, parsedAmt) Then
        dgr.Cells("Amt").Value = parsedAmt
    Else
        'Handle the case where your conversion fails, perhaps show an error message etc...
    End If
Next