C # Propertygrid default typeconverter

Question

I have a grid property with a dropdown. In my application, the user can click on a block, and then the properties of that block are displayed in the properties. But the first time you click on a block, an invalid value (0) is displayed in the drop-down list. How can I make sure that the actual value is displayed?

Here is the TypeConverter code:

public class DynamicFormScreenId : Int32Converter
{

    public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
    {
        return true;
    }

    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
    {
        Database database = new Database();
        database.StoredProcedureName = "SP naam";

        int[] id = null;
        if (database.ExecuteStoredProcedure())
        {
            int totalIds = database.DataTable.Rows.Count; 
            id = new int[totalIds];

            for (int i = 0; i < totalIds; i++)
            {
                id[i] = Convert.ToInt32(database.DataTable.Rows[i][0]);
            }
        }

        return new StandardValuesCollection(id);
    }

    public override bool GetStandardValuesExclusive(
                       ITypeDescriptorContext context)
    {
        return true;
    }
}

And the property in my class:

[TypeConverter(typeof(DynamicFormScreenId)),
CategoryAttribute("Screen Settings"),
Description("The id of the screen")]
public int ScreenId
{
    get { return _screenId; }
    set { _screenId = value; }
}

DECISION

I set the default value for ScreenId in the constructor:

private void Constructor(string name)
{
    _controlName = name;

    // Set screenId default value
    Database database = new Database("connectionstring");
    database.StoredProcedureName = "mySP";

    if (database.ExecuteStoredProcedure())
    {
        if (database.DataTable.Rows.Count > 0)
        {
            _screenId = Convert.ToInt32(database.DataTable.Rows[0]["id"]);
        }
    }
}

Answer 1

Have you tried DefaultValueAttribute in System.ComponentModel?

From MSDN:

DefaultValueAttribute . , , . reset .

private bool myVal=false;

[DefaultValue(false)]
 public bool MyProperty {
    get {
       return myVal;
    }
    set {
       myVal=value;
    }
 }

Answer 2

ScreenId PropertyGrid. , dbase. , , ScreenId, .