[Error][DataGridView] Index out of Range

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I receive an "Index out of Range" error when I try to change text on Columns Header. See code below:

private void cboMonth_TextChanged(object sender, EventArgs e)
{
    dgvAnnual.DataSource = null;
    dgvAnnual.Rows.Clear();
    dgvAnnual.Columns.Clear();

    BindingSource bSource = new BindingSource();
    bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
    dgvAnnual.DataSource = bSource;

    //Testing Code
    Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
    Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

    //The Code below is Working
    string[] str = {"Col1","Col2","Col3","Col4"};
    For(int i = 0;i<dvgAnnual.Columns.Count;i++)
    {
        dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
    }

    //The Code below not working if it stay outside For
    dgvAnnual.Columns[0].HeaderText = "Col1"; //<----- Error if stay alone like this
}

Working Code :

    private void cboMonth_TextChanged(object sender, EventArgs e)
    {
       dgvAnnual.DataSource = null;
       dgvAnnual.Rows.Clear();
       dgvAnnual.Columns.Clear();

       BindingSource bSource = new BindingSource();
       bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
       dgvAnnual.DataSource = bSource;

       //Using for testing
       Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
       Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

       //This Code below Working
       string[] str = {"Col1","Col2","Col3","Col4"};
       For(int i = 0;i<dvgAnnual.Columns.Count;i++)
       {
           dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
       }
    }

Not Working:

    private void cboMonth_TextChanged(object sender, EventArgs e)
    {
        dgvAnnual.DataSource = null;
        dgvAnnual.Rows.Clear();
        dgvAnnual.Columns.Clear();

        BindingSource bSource = new BindingSource();
        bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
        dgvAnnual.DataSource = bSource;

        //Testing Code
        Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
        Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

        //This code below not working
        dgvAnnual.Columns[0].HeaderText = "Col " + 1; //<----- Error: Index out of Range
    }

Error catch on Watch1

    +   dgvAnnual.Columns[0]    'dgvAnnual.Columns[0]' threw an exception of type 'System.ArgumentOutOfRangeException'  System.Windows.Forms.DataGridViewColumn {System.ArgumentOutOfRangeException}

Thanks

[Solved] Index was out of range : Datagridview, Getting “Index was out of range” exception in DataGridView when clicking header RRS feed � Visual Studio Languages [a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"); if (txtEmail. Text. Show("Email is required", "Error", MessageBoxButtons. CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100

The value of the Columns is 4 here but in the loop you have ranged it i = 0; to i<=4 means total number is 5. so change your range of for loop. use i is less then dvgAnnual.Columns.count instead of i is less than and equal to dvgAnnual.Columns.count. Just try it.

    for(int i = 0;i<dvgAnnual.Columns.count;i++)
    {
        dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
    }      

Getting “Index was out of range” exception in DataGridView when , Gets a collection that contains all the rows in the DataGridView control. To retrieve the index of a row with a particular state, use the GetFirstRow, GetLastRow,� Here we all can see that I’m trying to print the value of a list at an index ‘5’ but here in the array, we don’t have any element at that index. Now the interpreter will try to parse this code and it will not find any value at 4th index and ultimately it will fail to print the value.

Solution: the datagridview must be linked to a form

Example: dgv_Example.Parent = frm_Example

DataGridView.Rows Property (System.Windows.Forms), DataGridView Index was out of range. Must be non-negative Parameter name: index' [![enter image description here][2]][2]. I get this error� Final Answer [SOLVED]: If you have a list with 53 items, the last one is thelist[52] because indexing starts at 0 (zero).

c#: DataGridView Index was out of range. Must be non-negative, Discussion of topic Getting wrong index after sorting columns DataGrid in Silverlight But how do i find out what row on the DataGrid that maps to? as I can't just use MyGridData[ myGrid. DisplayIndex]["id_ROW_NUM"] =" http:// csharp.net-informations.com/datagridview/csharp-datagridview-tutorial.htm. You should know, the index in DataGridView begin with 0 and end with RowCount-1. If you use for loop, you should check its max is **Count-1. On the other hand, you want to use add new row, when you begin to add new row to your datagridview, the index will plus one,but you don't submit to the datasource, so, the new row is a virtual row, but the

Getting wrong index after sorting columns DataGrid, In the above example we have initialized a “list1“ which is an empty list and we are trying to assign a value at list1[1] which is not present, this is the reason python compiler is throwing “IndexError: list assignment index out of range”.

For ctr As Integer = startIndex To numbers.Count - 1 Console.Write(" {0}", numbers(ctr)) Next End Sub End Module ' The example displays the following output if the user supplies ' 7 as a command-line parameter: ' Displaying values greater than or equal to 7: ' ' Unhandled Exception: System.ArgumentOutOfRangeException: ' Index was out of range.

Comments
  • For(int i = 0;i<=dvgAnnual.Columns.count;i++) should be '<' ! and of course 'Count'..
  • Your code has at least 2 errors that don't compile or make it crash. Please post a minimal reproducible example.
  • @Taw My failed, I'm correct it in my code
  • For loop is case sensitive by the way its for also debug your code and think about it from a logical standpoint why it works inside the loop vs outside the loop.. also Column Indexes are 0 based not 1 based also dgvAnnual.Columns[0].HeaderText = "Col " + 1; will error out as well.. you cannot assign an integer to a Text value change your code to this for testing dgvAnnual.Columns[0].HeaderText = "Col " + 1.ToString();
  • Well. you still din't get the spelling right but the main issue is probably that you have more than 4 columns..
  • so your syntax is incorrect in regards to the for loop it's lower case for(int i = 0;i<dvgAnnual.Columns.count;i++) if you are going to post an answer make sure it's proper syntax as well as it compiles correct your syntax error
  • I corrected my code. This is my failed when copy & pasted without checking it again. Sorry. The problem is the line dgvAnnual.Columns[0].HeaderText = "Col Name Here".
  • I pointed that out very quickly because I noticed someone downvoted you also the Header text should be a string and then inside the loop incrementing the column name as "Col " + i.ToString() this could have been handled like this in the declaration of the str variable string str = "Col ";
  • I got an error at the first run (i=0). I have another way to fix it, but I want to ask you for clearly understanding it. tks