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

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C#

string greenColor = "G";

OleDbCommand cmd = new OleDbCommand("Select ID from LED_DATA where color='" + greenColor + "'", con);
            OleDbDataReader reader =   cmd.ExecuteReader();

            while (reader.Read())
            {
                int r = Convert.ToInt16(reader[0].ToString());
                for (int c = 0; c < 8; c++)
                {
                   
                    dataGridView1.Rows[r].Cells[c].Style.ForeColor = Color.Green;

                    if (this.dataGridView1.ColumnCount == 7)
                    {
                        break;
                    }
                }
                
            }

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

Please help me as soon as possible.. I need it urgently.

Posted 18-Nov-13 19:44pm

Member 10329286

Updated 18-Nov-13 19:55pm

Orcun Iyigun

v3

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ArunRajendra 19-Nov-13 1:49am

In which line are you getting this exception?

Member 10329286 19-Nov-13 4:17am

dataGridView1.Rows[r].Cells[c].Style.ForeColor = Color.Green;
At this line i am getting exception.

Kornfeld Eliyahu Peter 19-Nov-13 1:52am

You have only one cell! The ID one! But you try read 8 of them!!!

dataGridView1.Rows[r].Cells[c] -> c is varying from 0 to 7...

2 solutions

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phil.o · Answer 1 · 2013-11-18T19:55:00

Solution 1

C#

for (int c = 0; c < 7; c++)

Apparently your grid has 7 columns, so in your loop you have to go from 0 to to 6.

Posted 18-Nov-13 19:55pm

phil.o

OriginalGriff · Answer 2 · 2013-11-18T19:56:00

Either your table does not have 8 columns, or the number of rows you are reading as the first column in each row does not match the rows count for the DataGridView.

Use the debugger: put a breakpoint on the line

C#

dataGridView1.Rows[r].Cells[c].Style.ForeColor = Color.Green;

And look at the value of r and c to check which is out of range.