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Hello,

I am having an issue with DataGridView1_CellClick event. Whenever I am clicking on any column(cell), I am getting an error
Index was out of range. Must be non-negative and less than the size of the collection parameter name:index
.

The error is in the first line itself:

if (Convert.ToString(DataGridView1.Rows[e.RowIndex].Cells[6].Value) != "")


Please help.

Regards
Aman Chaurasia

What I have tried:

try
            {
                if (Convert.ToString(DataGridView1.Rows[e.RowIndex].Cells[6].Value) != "")
                {
                    if (ZonesItems == null)
                    {
                        if (PictureBox1.Image == null)
                        {
                            DrawZonesFromDgv(Convert.ToString(DataGridView1.Rows[e.RowIndex].Cells[6].Value));
                        }
                        else
                        {
                            DrawZonesFromDgv();
                        }
                        if (ZonesItems.Count > 0)
                        {
                            foreach (var Zone in ZonesItems)
                            {
                                if (Zone.ZoneNo == Convert.ToInt32(DataGridView1.Rows[e.RowIndex].Cells[6].Value))
                                {
                                    Zone.Clicked = true;
                                }
                                else
                                {
                                    Zone.Clicked = false;
                                }
                            }
                        }
                    }
                    else
                    {
                        if (ZonesItems.Count > 0)
                        {
                            foreach (var Zone in ZonesItems)
                            {
                                if (Zone.ZoneNo == Convert.ToInt32(DataGridView1.Rows[e.RowIndex].Cells[6].Value))
                                {
                                    Zone.Clicked = true;
                                }
                                else
                                {
                                    Zone.Clicked = false;
                                }
                            }
                        }
                    }
                    PictureBox1.Invalidate();
                }
                if (e.ColumnIndex == 3 || e.ColumnIndex == 4)
                {
                    RichTextBox2.Text = Convert.ToString(DataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);
                    DatagridRowClicked = e.RowIndex;
                    DatagridColClicked = e.ColumnIndex;
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
Posted
Updated 19-May-18 3:22am
Comments
Richard MacCutchan 19-May-18 9:08am    
It means that either the row index value (RowIndex) or column (6) are invalid. Use your debugger to find out which.

1 solution

Index was out of range. Must be non-negative and less than the size of the collection parameter name:index

Use the debugger to inspect variable a line of error.
Check number of rows of DataGridView1 and compare with e.RowIndex
Check number of Cells in DataGridView1.Rows[e.RowIndex] and make sure there is at least 7.

Your code do not behave the way you expect, and you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[^]
Debugging C# Code in Visual Studio - YouTube[^]
The debugger is here to only show you what your code is doing and your task is to compare with what it should do.
 
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