protected void btnSetParameter_Click(object sender, EventArgs e)
    {
        var selected = GetSelected(hdnParamSelected.Value);

        if (selected != null)
        {
            string paramName = hdnParam.Value.ToLowerCSafe();

            var param = selected.Parameters[paramName];
            if (param != null)
            {
                if (formElem.ValidateData())
                {
                    // Load value from the form control
                    var ctrl = formElem.FieldControls[paramName];
                    if (ctrl != null)
                    {
                        var  dataType            = ctrl.FieldInfo.DataType;
                        bool nullForDefaultValue = !DataTypeManager.IsNumber(TypeEnum.Field, dataType);

                        // If value is not a number and it is default value of its data type (e.g. Guid.Empty for Guid), convert it to null
                        object convertedValue = DataTypeManager.ConvertToSystemType(TypeEnum.Field, dataType, ctrl.Value, null, nullForDefaultValue);

                        // Convert values to EN culture
                        string value       = ValidationHelper.GetString(convertedValue, String.Empty, CultureHelper.EnglishCulture);
                        string displayName = ctrl.ValueDisplayName;

                        if (String.IsNullOrEmpty(displayName) && !String.IsNullOrEmpty(value))
                        {
                            displayName = value;
                            param.ApplyValueTypeConversion = true;
                        }

                        param.Value     = value;
                        param.Text      = displayName;
                        param.ValueType = dataType;
                    }

                    pnlModalProperty.Visible = false;
                    pnlFooter.Visible        = false;
                }
                else
                {
                    pnlModalProperty.Visible = true;
                    pnlFooter.Visible        = true;
                    mdlDialog.Visible        = true;
                    mdlDialog.Show();
                }
            }
        }
    }
 private static bool UseNullInsteadOfDefaultValue(string dataType)
 {
     // For data types except numeric and boolean ones we need to use null value instead of default one
     // To avoid usage of Guid.Empty for Guid data type etc.
     return(!DataTypeManager.IsNumber(TypeEnum.Field, dataType) && !DataTypeManager.IsType <bool>(TypeEnum.Field, dataType));
 }