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This is the value at the time of editing the DataRow. If the RowState is Deleted, an exception is thrown. If the BeginEdit method has not been explicitly executed, or if BeginEdit was implicitly executed via editing a detached DataRow (an orphaned DataRow object that has not been added to a DataTable object), a VersionNotFoundException is thrown.
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You can also query the HasVersion method on the DataRow object to test for the exist ence of a particular DataRowVersion. You can use this method to test for the existence of a DataRowVersion before attempting to retrieve a version that does not exist. The fol lowing code snippet demonstrates how to retrieve a string using the RowState and the DataRowVersion:
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'VB Private Function GetDataRowInfo( _ ByVal row As DataRow, ByVal columnName As String) _ As String Dim retVal As String = String.Format( _
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"RowState: {0} <br />", row.RowState)
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Dim versionString As String
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For Each versionString In [Enum].GetNames( _
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GetType(DataRowVersion))
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Dim version As DataRowVersion = _
CType([Enum].Parse(GetType(DataRowVersion), _
versionString), DataRowVersion)
If (row.HasVersion(version)) Then retVal += String.Format( _
"Version: {0} Value: {1} <br />", _
version, row(columnName, version))
Else retVal += String.Format( _
"Version: {0} does not exist.<br />", _
version)
End If
Next
Return retVal
End Function //C# private string GetDataRowInfo(DataRow row, string columnName) { string retVal = string.Format(
"RowState: {0}<br />",
row.RowState);
foreach (string versionString in
Enum.GetNames(typeof(DataRowVersion)))
Lesson 1: Using the ADO.NET Disconnected Classes
DataRowVersion version = (
DataRowVersion)Enum.Parse(
typeof(DataRowVersion), versionString);
if (row.HasVersion(version))
retVal += string.Format(
"Version: {0} Value: {1}<br />",
version, row[columnName, version]);
else
retVal += string.Format(
"Version: {0} does not exist.<br />",
version);
return retVal;
Resetting the RowState with AcceptChanges and RejectChanges The AcceptChanges method is used to reset the DataRow state to Unchanged. This method exists on the DataRow, DataTable, and DataSet objects. (We cover DataSet later in this chapter.) After data has been loaded from the database, the RowState property of the loaded rows is set to Added. Calling AcceptChanges on the DataTable resets the RowState of all of the DataRow objects to Unchanged. If you modify the DataRow objects, their RowState changes to Modified. When you are ready to save the data, you can easily query the DataTable object for its changes by using the GetChanges method on the DataTable object, which returns a DataTable that is populated only with the DataRow objects that have changed since the last time that AcceptChanges was executed. Only the changes need to be sent to the data store.
After the changes have been successfully sent to the data store, change the state of the DataRow objects to Unchanged by calling the AcceptChanges method, which indicates that the DataRow objects are synchronized with the data store. Note that executing the AcceptChanges method also causes the DataRow object s Current DataRowVersion to be copied to the DataRow object s Original version. Consider the following code snippet:
'VB Protected Sub Button2_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Button2.Click
'add label to form
Dim lbl As New Label()
lbl.Style.Add("position", "absolute")
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lbl.Style.Add("left", "275px")
lbl.Style.Add("top", "20px")
lbl.EnableViewState = false
form1.Controls.Add(lbl)
'get the first row to play with
Dim dr As DataRow = GetDataTable().Rows(0)
'clear the rowstate
dr.AcceptChanges()
'make change in a single statement
dr("FirstName") = "Marie"
'start making changes that may span multiple statements
dr.BeginEdit()
dr("FirstName") = "Marge"
lbl.Text = GetDataRowInfo(dr, "FirstName")
dr.EndEdit()
End Sub //C# protected void Button2_Click(object sender, EventArgs e) {
//add label to form
Label lbl = new Label();
lbl.Style.Add("position", "absolute");
lbl.Style.Add("left", "275px");
lbl.Style.Add("top", "20px");
lbl.EnableViewState = false;
form1.Controls.Add(lbl);
//get the first row to play with
DataRow dr = GetDataTable().Rows[0];
//clear the rowstate
dr.AcceptChanges();
//make change in a single statement
dr["FirstName"] = "Marie";
//start making changes that may span multiple statements
dr.BeginEdit();
dr["FirstName"] = "Marge";
lbl.Text = GetDataRowInfo(dr, "FirstName");
dr.EndEdit();
This code starts by adding a Label control to the Web page that holds the results of this test. Next, the first DataRow object in the employee DataTable is retrieved. The DataRow has an initial RowState of Added, and the AcceptChanges method clears the RowState to Unchanged. Next, the FirstName is modified in a single statement, which causes the RowState to become Modified. At this time, the Current version contains the modified data and the Original version contains the data values that exist after the AcceptChanges method is executed. Next, the BeginEdit method is executed to place the DataRow in an edit mode and the FirstName is changed again. At this time,
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