CODEWITHSUNDEEP
c#winformsdatagridviewdatatable
Willy
Willy

Reputation: 10644

C# Winforms: Inserting an item to datagridview's top moves scroll down

I have a datagridview bind to a datatable through datagridview's datasource property. Rows are added one by one and always at the datagridview's top using below line of code, for example:

DataRow newRow = myDataTable.NewRow();
newRow[0] = "column1 value";
newRow[1] = "column2 value";
myDataTable.Rows.InsertAt(newRow, 0);

The problem is that datagridview vertical scroll moves down making not visible the last row added at the top of the datagridview so I do not want vertical scroll to move down in order to make visible last row inserted at top.

How can I do this?

ATTEMPT 1:

DataGridViewRow selectedRow = null;
if (dataGridView1.SelectedRows.Count > 0)
   selectedRow = dataGridView1.SelectedRows[0];

DataRow newRow = myDataTable.NewRow();
newRow[0] = "column1 value";
newRow[1] = "column2 value";
myDataTable.Rows.InsertAt(newRow, 0);

if (selectedRow != null)
   dataGridView1.FirstDisplayedScrollingRowIndex = selectedRow.Index;
else
   dataGridView1.FirstDisplayedScrollingRowIndex = 0;

extracted from here.

Seems not working. dataGridView1.FirstDisplayedScrollingRowIndex always is 0 but datagridview continues scrolling down.

Upvotes: 0

Views: 662

Answers (2)

ndomanovskiy
ndomanovskiy

Reputation: 98

FirstDisplayedScrollingRowIndex will work if you work with datagridview on direct.

For example:

Form1.cs

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        dataGridView1.Columns.Add("firstColumn", "Name");
        dataGridView1.Columns.Add("secondColumn", "Mark");
        dataGridView1.Rows.Add(99);

        for (int i = 99; i >= 0; i--)
        {
            dataGridView1[0, i].Value = "column1 value " + (100 - i);
            dataGridView1[1, i].Value = "column2 value " + (100 - i);
        }

        dataGridView1.FirstDisplayedScrollingRowIndex = 0;
    }
}

Result

enter image description here

Upvotes: 0

Ayoub_B
Ayoub_B

Reputation: 700

You only need to scroll to the top of the DataGridView each time you add a new row. You can do so by setting the property FirstDisplayedScrollingRowIndex to the very first row which has the index 0:

dataGridView.FirstDisplayedScrollingRowIndex = 0;

Upvotes: 2

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