Hi Chuck ,

Yes, based on the RejectChanges method logic, it will only roll back the
data changes to the data, it will not reset the ErrorText on row or cells.

To clear the error icon of the DataGridView, we may clear all the ErrorText
in the datasource, then the error icon will disappear. This is because the
.Net winform databinding will update your changes in datasource into the UI
DataGridViewRow.ErrorText property. My testing code snippet is listed below:

DataTable dt = null;
private void Form1_Load(object sender, EventArgs e)
{
   dt = new DataTable();
   dt.Columns.Add("column1", typeof(int));
   dt.Columns.Add("column2", typeof(string));
   for (int i = 0; i < 5; i++)
   {
       DataRow dr = dt.NewRow();
       dr["column1"] = i;
       dr["column2"] = "item" + i.ToString();
       dt.Rows.Add(dr);
   }
   dt.AcceptChanges();
   this.dataGridView1.DataSource = dt;
}

private void button1_Click(object sender, EventArgs e)
{
   this.dt.Rows[1].RowError = "abc";
}

private void button2_Click(object sender, EventArgs e)
{
   dt.RejectChanges();
   for (int i = 0; i < dt.Rows.Count; i++)
   {
       this.dt.Rows[i].RowError = "";
   }

   dataGridView1.Refresh();
}

This code snippet works well on my side. Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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