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#1 Red Prince   User is offline

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IndexOutOfRange Exception When Click On Any DataGridView Cell

Posted 10 December 2014 - 07:04 AM

Last Week I'm Working On A WinFroms Project And I Created A Cart Form. In Cart, There Is A DataGridView Control & It Contains A Column Named purchasedQuantity.
purchasedQuantity Is Editable & User Can Enter Value Only In This Column. Here Is The EvenHandler For CellEndEdit
private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e) 
    if (e.RowIndex <= 0 || e.ColumnIndex != 4)

    int row = e.RowIndex;
    int demandedQuantity = int.Parse(this.dataGridView1.Rows[row].Cells["purchasedQuantity"].Value.ToString());
    int inStockQunatity = int.Parse(this.dataGridView1.Rows[row].Cells["unitsInStock"].Value.ToString());
    double price = double.Parse(this.dataGridView1.Rows[row].Cells["unitPrice"].Value.ToString());

    if (demandedQuantity <= inStockQunatity)
        this.dataGridView1.Rows[row].Cells["subTotal"].Value = (demandedQuantity * price).ToString();
        this.dataGridView1.Rows[row].Cells["unitsInStock"].Value = (inStockQunatity - demandedQuantity).ToString();
        this.dataGridView1.Rows[row].Cells["purchasedQuantity"].Style.BackColor = System.Drawing.Color.White;
        MessageBox.Show(string.Format("We Have Only {0} Left In The Stock..!!", inStockQunatity.ToString()), "Error", MessageBoxButtons.OK);
        this.dataGridView1.Rows[row].Cells["purchasedQuantity"].Style.BackColor = System.Drawing.Color.Red;

The Problem Is That Whenever I Click On Any Cell Of The DataGridView, I Get The Following Error:

An unhandled exception of type 'System.IndexOutOfRangeException' occurred in System.Windows.Forms.dll Additional information: Index -1 does not have a value.
Make sure that the maximum index on a list is less than the list size
Make sure the index is not a negative number.
Make sure data column names are correct.

I Have A Home Form That Create ViewProduct Form Instance And That ViewProduct Form Creates Cart Form Instance & I Get Error In The Home Form In The Following Function:
private void ShowForm(Form form) 


On The Following Line:

Here Is How Sequence Of Form Calling: Home => ViewProdcuts => Cart
As I Mentioned First, I Start Working On It Last Week. At That Time It Works Fine, No Exceptions Are Thrown On Clicking On Any Row & I Was Able To Enter Value In The purchasedQuanttiy Cell.
After One Week It Get Angry, Don't Know Why (Just Kidding)
I Googled That Problem But Found No Answer. Can Anybody Please Tell Me What Is Wrong With This Code.
Thanks In Advance For Reply

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Replies To: IndexOutOfRange Exception When Click On Any DataGridView Cell

#2 tlhIn`toq   User is offline

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Re: IndexOutOfRange Exception When Click On Any DataGridView Cell

Posted 10 December 2014 - 07:10 AM

Short version: You have a range of 10 items in your collection and you ask the collection for item 14. Clearly that item is out of the range, because it doesn't exist.
Long version: Covered in the tutoral "What is this error message?" linked below.

See FAQ # 2 below

TOP most asked:
What does this error message mean?
FAQ 2: How do I debug
FAQ 6: How do I make Class1/Form1 talk to Class2/Form2

FAQ (Frequently Asked Questions - Updated July 2014

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