GridDateTimeColumn DataFormatString not working from codebehind

[Daniele]

Hi all,
I'm dinamically adding columns to my RadGrid.
I need to add a GridDateTimeColumn to show and allow the user change a time, so I need to display data in format HH:ss .
I am trying to do this using DataFormatString property but it doesn't work: I always see the standard format yyyy/MM/dd HH:mm:ss .

Here is my code:

                    GridDateTimeColumn col = new GridDateTimeColumn();
                    col.PickerType = GridDateTimeColumnPickerType.TimePicker;
                    col.DataField = "FIELD";
                    col.DataType = typeof(DateTime);
                    col.DataFormatString = "{0:HH mm}";
                    myRadGrid.MasterTableView.Columns.Add(col);

Can anyone help me?
Thanks in advance.

[Princy]

Hi Daniele,

Your code looks fine, it worked fine at my end. Please try the sample code snippet and check if it helps.

C#:

RadGrid rgrdSample;
protected void Page_Init(object source, System.EventArgs e)
{
    rgrdSample = new RadGrid();
    rgrdSample.ID = "rgrdSample";
    rgrdSample.MasterTableView.DataKeyNames = new string[] { "OrderID" };
    rgrdSample.AllowPaging = true;
    rgrdSample.AutoGenerateColumns = false;
    rgrdSample.AllowSorting = true;
    rgrdSample.NeedDataSource += new GridNeedDataSourceEventHandler(RadGrid1_NeedDataSource);
    rgrdSample.PreRender += new EventHandler(rgrdSample_PreRender);

    GridBoundColumn boundColumn;
    boundColumn = new GridBoundColumn();
    boundColumn.DataField = "OrderID";
    boundColumn.HeaderText = "OrderID";
    rgrdSample.MasterTableView.Columns.Add(boundColumn);

    boundColumn = new GridBoundColumn();
    boundColumn.DataField = "ShipCountry";
    boundColumn.HeaderText = "ShipCountry";
    boundColumn.SortExpression = "ShipCountry";
    rgrdSample.MasterTableView.Columns.Add(boundColumn);

    GridDateTimeColumn datecolumn = new GridDateTimeColumn();
    datecolumn.PickerType = GridDateTimeColumnPickerType.TimePicker;
    datecolumn.DataField = "OrderDate";
    datecolumn.HeaderText = "OrderDate";
    datecolumn.DataType = Type.GetType("System.DateTime");
    datecolumn.DataFormatString = "{0:HH:mm}";
    datecolumn.UniqueName = "OrderDate";
    rgrdSample.MasterTableView.Columns.Add(datecolumn);

    this.PlaceHolder1.Controls.Add(rgrdSample);
}

//Another way is you can try to set in PreRender event if the above doesn't work
void rgrdSample_PreRender(object sender, EventArgs e)
{
    GridBoundColumn col;
    col = (GridBoundColumn)rgrdSample.MasterTableView.GetColumn("OrderDate");
    col.DataType = Type.GetType("System.DateTime");
    col.DataFormatString = "{0:HH:mm}";
    rgrdSample.Rebind();
}

void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    rgrdSample.DataSource = GetDataTable("SELECT  *  FROM Orders");
}

public DataTable GetDataTable(string query)
{
    String ConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    SqlConnection conn = new SqlConnection(ConnString);
    SqlDataAdapter adapter = new SqlDataAdapter();
    adapter.SelectCommand = new SqlCommand(query, conn);
    DataTable myDataTable = new DataTable();
    conn.Open();
    try
    {
        adapter.Fill(myDataTable);
    }
    finally
    {
        conn.Close();
    }
    return myDataTable;
}

Thanks,
Princy

[Daniele]

Princy, thank you for your answer!
I tried to add formatting in the PreRender event, but always the same.

To be sure that what I am doing takes effect, I tried the following in my code:
   col.DataFormatString = "xx{0:HH mm}";
In this way I can see the following (for example):
   xx2014/01/01 07:30:00
That means that the formatting that I am setting takes somehow effect on rendering.

But I cannot understand why the part in brackets takes no effect.

[Daniele]

I solved it!!
The datasource of my RadGrid is a DataTable which is created dinamically, too.
Even if in my column I was adding DateTime values, I had not specified the type of the column:
   [...]
   table.Columns.Add("date");
   [...]
   row["date"] = DateTime.Now;
   [...]

Specifyng tha type of data in this datasource solved the problem:
   [...]
   table.Columns.Add("date", typeof(DateTime));
   [...]
   row["date"] = DateTime.Now;
   [...]


Thank you all!!!