Tuesday, August 23, 2011

Insert, edit and delete data in a data table by ASPxGridView at runtime

It shows how to insert, edit and delete data in a data table by ASPxGridView. The data table and the
grid are created at runtime.
public partial class _Default : System.Web.UI.Page {
    private DataTable dataTable;

    protected void Page_Load(object sender, EventArgs e) {
        CreateGrid();
    }

    private DataTable CustomDataSourse {
        get {
            if (dataTable != null)
                return dataTable;

            dataTable = ViewState["CustomTable"] as DataTable;
            if (dataTable != null)
                return dataTable;


            dataTable = new DataTable("CustomDTable");
            dataTable.Columns.Add("Id", typeof(Int32));
            dataTable.PrimaryKey = new DataColumn[] { dataTable.Columns[0] };
            dataTable.Columns.Add("Data", typeof(string));

            dataTable.Rows.Add(0, "Data1");
            dataTable.Rows.Add(1, "Data2");
            dataTable.Rows.Add(2, "Data3");
            dataTable.Rows.Add(3, "Data4");
            dataTable.Rows.Add(4, "Data5");
            ViewState["CustomTable"] = dataTable;

            return dataTable;
        }
    }
    protected void grid_DataBinding(object sender, EventArgs e) {
        (sender as ASPxGridView).DataSource = CustomDataSourse;
    }
    protected void grid_DataBound(object sender, EventArgs e) {
        ASPxGridView g = sender as ASPxGridView;
        for (int i = 0; i < g.Columns.Count; i++) {
            GridViewDataTextColumn c = g.Columns[i] as GridViewDataTextColumn;
            if (c == null)
                continue;

            c.PropertiesTextEdit.ValidationSettings.RequiredField.IsRequired = true;
        }

    }


    protected void grid_RowDeleting(object sender, ASPxDataDeletingEventArgs e) {
        int id = (int)e.Keys[0];
        DataRow dr = CustomDataSourse.Rows.Find(id);
        dataTable.Rows.Remove(dr);

        ASPxGridView g = sender as ASPxGridView;
        UpdateData(g);
        e.Cancel = true;
    }
    protected void grid_RowUpdating(object sender, ASPxDataUpdatingEventArgs e) {
        int id = (int)e.OldValues["Id"];
        DataRow dr = CustomDataSourse.Rows.Find(id);
        dr[0] = e.NewValues["Id"];
        dr[1] = e.NewValues["Data"];

        ASPxGridView g = sender as ASPxGridView;
        UpdateData(g);
        g.CancelEdit();
        e.Cancel = true;
    }
    protected void grid_RowInserting(object sender, ASPxDataInsertingEventArgs e) {
        CustomDataSourse.Rows.Add(e.NewValues["Id"], e.NewValues["Data"]);

        ASPxGridView g = sender as ASPxGridView;
        UpdateData(g);
        g.CancelEdit();
        e.Cancel = true;
    }

    private void CreateGrid() {
        ASPxGridView grid = new ASPxGridView();
        grid.ID = "grid";
        this.Form.Controls.Add(grid);

        grid.EnableCallBacks = false;
        grid.KeyFieldName = "Id";

        grid.DataBinding += grid_DataBinding;
        grid.RowDeleting += grid_RowDeleting;
        grid.RowUpdating += grid_RowUpdating;
        grid.RowInserting += grid_RowInserting;
        grid.DataBound += grid_DataBound;
        grid.RowValidating += new ASPxDataValidationEventHandler(grid_RowValidating);
        grid.DataBind();
        if (!this.IsPostBack) {
            GridViewCommandColumn c = new GridViewCommandColumn();
            grid.Columns.Add(c);

            c.EditButton.Visible = true;
            c.UpdateButton.Visible = true;
            c.NewButton.Visible = true;
            c.DeleteButton.Visible = true;
            c.CancelButton.Visible = true;
        }

        GridViewDataTextColumn col = grid.Columns["Id"] as GridViewDataTextColumn;
        col.PropertiesTextEdit.ValidationSettings.RegularExpression.ValidationExpression
                                                                            = "\\d{1,9}";
    }

    void grid_RowValidating(object sender, ASPxDataValidationEventArgs e) {       
        int id = (int)e.NewValues["Id"];
        if ((!e.OldValues.Contains("Id") || ((int)e.OldValues["Id"] != id))
            && (CustomDataSourse.Rows.Find(id) != null)) {
            ASPxGridView grid = sender as ASPxGridView;
            e.Errors[grid.Columns["Id"]] =
String.Format("Column 'Id' is constrained to be unique.  Value '{0}' is already present.", id);
        }
    }
    private void UpdateData(ASPxGridView g) {
        ViewState["CustomTable"] = dataTable;
        g.DataBind();
    }
}

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