Hi,

I am getting this exception and need help badly.

Scenario:

I have a table Users. Binded this entity to GridView.

I have one more table Roles. Id of Roles is foreignKey RoleID in Users.

Binded this as a combo-box column in GridView

this.radGridView.Columns.Add(new GridViewComboBoxColumn()
                            {
                                ItemsSourceBinding = new System.Windows.Data.Binding("Roles") { Source = this.DataContext },
                                DataMemberBinding = new System.Windows.Data.Binding("Role") ,
                                DisplayMemberPath = "Role",
                                SelectedValueMemberPath = "RoleID",
                                Header = "User-Role",
                                FilterMemberPath="RoleReconUserRoles.Role",
                                IsReadOnly=false,
                                Name = "gridView"
                            });

It works fine. But, when I change the item in the combo-box, and try to commit, it changes back to the original value because I get this ForeignKeyReferenceAlreadyHasValueException exception in the entity.

/// <summary>
        /// Gets or sets the Role column value.
        /// </summary>
        [System.Data.Linq.Mapping.Column(Name = "Role", Storage = "_role", DbType = "int NOT NULL", IsPrimaryKey = true, CanBeNull = false, UpdateCheck = System.Data.Linq.Mapping.UpdateCheck.Never)]
        [System.Runtime.Serialization.DataMember(Order = 3)]
        [System.CodeDom.Compiler.GeneratedCode("CodeSmith", "6.0.0.0")]
        public int Role
        {
            get { return _role; }
            set
            {
                if (_role != value)
                {
                    if (_roleReconUserRoles.HasLoadedOrAssignedValue)
                    {
                        throw new System.Data.Linq.ForeignKeyReferenceAlreadyHasValueException();
                    }
                    OnRoleChanging(value);
                    SendPropertyChanging("Role");
                    _role = value;
                    SendPropertyChanged("Role");
                    OnRoleChanged();
                }
            }
        }

 

Any help is appreciated!

Thanks in advance,

Sindhu

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We are currently using Telerik () RadGridview for our WPF client application. The data is displayed in ScheduleView format for users as Weeks/Days where user can create a block (Tile) on a specific day and time. Once the block is created on the grid user can select the block and edit the contents. The data that is binded to the grid is coming from SQL Server database which is common to all the users who are using this client application and Schedule Grid.

Our business requirement is, when a particular user has open this schedule grid on his screen, he see all the blocks created by different users including his own blocks. User should be able to edit his block and at the same time all other blocks on the screen inside the grid should be auto refreshed (may be after 1 min) to reflect the changes saved in DB by other users that too without restricting the user to edit his own block and without locking the UI. User should be still allowed to continue his edit operation when auto refresh is happening for other changed blocks...

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