C# App - Overload CurrencyManager AddNew method

[back100y]

I have an application where I am using a DataGridView control to display DataTables stored in a DataSet. What I need to do is be able to prevent a user from adding a new if there is already a certain number of rows in the table. In addition, when the user deletes a row I need to be able to see the contents of that row and modify other rows in the DataTable appropriately.

From what I understand of the DataGridView controls interaction with its bound DataSet, it uses the a CurrencyManager to make changes to the table. I have tried to derive a class from CurrencyManger and create overloaded AddNew and RemoveAt methods, but I am not able to get the code to complie.

For Example:
public class NewCurrencyMana ger : CurrencyManager
{
public NewCurrencyMana ger(){
}

public override void AddNew()
{
if (this.Count > 15)
{
MessageBox.Show ("Out of Bounds");
}
else
base.AddNew();
}
}

Causes the error: error CS0143: The type 'System.Windows .Forms.Currency Manager' has no constructors defined

If the CurrencyManger is the right place to be looking, how should this be modified? If not, what approach should I be using?

Thanks

[r035198x]

I have an application where I am using a DataGridView control to display DataTables stored in a DataSet. What I need to do is be able to prevent a user from adding a new if there is already a certain number of rows in the table. In addition, when the user deletes a row I need to be able to see the contents of that row and modify other rows in the DataTable appropriately.

From what I understand of the DataGridView controls interaction with its bound DataSet, it uses the a CurrencyManager to make changes to the table. I have tried to derive a class from CurrencyManger and create overloaded AddNew and RemoveAt methods, but I am not able to get the code to complie.

For Example:
public class NewCurrencyMana ger : CurrencyManager
{
public NewCurrencyMana ger(){
}

public override void AddNew()
{
if (this.Count > 15)
{
MessageBox.Show ("Out of Bounds");
}
else
base.AddNew();
}
}

Causes the error: error CS0143: The type 'System.Windows .Forms.Currency Manager' has no constructors defined

If the CurrencyManger is the right place to be looking, how should this be modified? If not, what approach should I be using?

Thanks

I doubt if you need to write your own CurrencyManager here. I think you only need to intercept the event called when you click the save button and do the validations at that point.