hmm, using the post delete hook does not seem tio be the right way, so I think the solution should be changing the ClearAllRules code to the following (similar changes shuold be made to ClearAllWarnings):

public override void ClearAllRules()
{
mmErrorProviderArgs ep;

this.BrokenRules.Clear();

// Clear all error provider broken rules
for (int i = 0; i < ErrorProviderBrokenRules.Count; i++)
{
ep = (mmErrorProviderArgs)ErrorProviderBrokenRules[i];
if (ep.DataView != null)
{
// Bug fix begin:
if (ep.Row < ep.DataView.Count)
{
ep.DataView[ep.Row].Row.SetColumnError(ep.ColumnName, "");
}
//ep.DataView[ep.Row].Row.SetColumnError(ep.ColumnName, "");
// bug fix end


}
else
{
if (ep.ErrorDataSet != null)
{
// Bug fix begin:
if (ep.Row < ep.ErrorDataSet.Tables[ep.TableName].Rows.Count)
{
ep.ErrorDataSet.Tables[ep.TableName].Rows[ep.Row].SetColumnError(ep.ColumnName, "");
}
//ep.ErrorDataSet.Tables[ep.TableName].Rows[ep.Row].SetColumnError(ep.ColumnName, "");
// bug fix end
}
}
}

this.ErrorProviderBrokenRules.Clear();
}


regards

Stig Nielsson