Question

If we have the following code, then when user clicks an Edit button, page is posted back and put into Edit mode:

protected void gvwEmployees_RowEditing(object sender, GridViewEditEventArgs e)
{
    gvwEmployees.EditIndex = e.NewEditIndex;

    gvwEmployees.DataSource = ds.Tables["Employees"];

    gvwEmployees.DataBind();
}

But with the following code, user has to click the Edit button twice before a row is put into edit mode ( thus page needs to be posted back twice before row gets into edit mode). Why does it matter whether gvwEmployees.EditIndex is assigned a value before or after we bind GridView to a data source?

protected void gvwEmployees_RowEditing(object sender, GridViewEditEventArgs e)
{
    gvwEmployees.DataSource = ds.Tables["Employees"];

    gvwEmployees.DataBind();

    gvwEmployees.EditIndex = e.NewEditIndex;
}

Thank you

Answer 1

Modifying the EditIndex property with a value different than the one it already has requires that DataBind() is called after the modification.

As described in the GridView.EditIndex documentation page, it could also happen if EditIndex is modified under other circumstances:

If you set the EditIndex property
after a postback or in handlers for
events that are raised later than the
Load event, the GridView control might
not enter edit mode for the specified
row. If you read the value of this
property in other event handlers, the
index is not guaranteed to reflect the
row that is being edited.