user2566013 user2566013 - 3 months ago 25
C# Question

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

I'm trying to add data as one by one row to a datagridview here is my code and it says:
"Index was out of range. Must be non-negative and less than the size of the collection
parameter name:index" what does this means ? is there any problem in my code

String Sqlstr2 = "select ItemName from Item where ItemID = '" + tbItemID.Text + "'";
db.DataRead(Sqlstr2);
string ItemName = db.dr["ItemName"].ToString();

DataGridView dataGridView1 = new DataGridView();

dataGridView1.Columns[0].Name = "ItemID";
dataGridView1.Columns[1].Name = "ItemName";
dataGridView1.Columns[2].Name = "Qty";
dataGridView1.Columns[3].Name = "UnitPrice";
dataGridView1.Columns[4].Name = "Amount";

string firstColum = tbItemID.Text;
string secondColum = ItemName;
string thirdColum = tbQuantity.Text;
string fourthColum = Convert.ToString(UnitPrice);
string fifthColum = Convert.ToString(sum);

string[] row = new string[]{ firstColum, secondColum, thirdColum, fourthColum, fifthColum };
dataGridView1.Rows.Add(row);

Answer

You're not adding columns to your DataGridView

DataGridView dataGridView1 = new DataGridView();//Create new grid

dataGridView1.Columns[0].Name = "ItemID";// refer to column which is not there 

Is it clear now why you get an exception?

Add this line before you use columns to fix the error

dataGridView1.ColumnCount = 5;
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