Cannot remove rows from DataTable because "Collection was modified; enumeration operation might not execute"

Question

This is my code to remove row from datatable:

DataTable dtapple = dt;

foreach (DataRow drapplicant in dtapple.Rows)
{
    int iapp = Convert.ToInt32(drapplicant["SrNo"].ToString());

    if (drapplicant["PassportExpDate"].ToString().Trim() != "")
    {
        //ViewState["iapp"] = drapplicant;
        dtapple.Rows.Remove(drapplicant);
    }
}

Now when I use above code the row is removed, but after that I get an error

Collection was modified; enumeration operation might not execute

I don't know exact reason.

Answer 1

Below code works for me :

for (int i = 0; i < dataTable.Rows.Count; i++)
{
    var tempRow = dataTable.Rows[i];
    var temp = dataTable.Rows[i][0];
    for (int j = 0; j < dataTable.Rows.Count; j++)
    {
        DataRow rows = dataTable.Rows[j];
        if (temp == rows[0].ToString())
        {
            tempdatatable.Rows.Add(tempRow[0], tempRow[1]);
            dataTable.Rows.Remove(rows);      //Update happen here
        }
        tempdatatable.DefaultView.Sort = "gscitations DESC";
        dataGridView1.DataSource = tempdatatable;
    }
}