"Object reference not set to an instance of an object" error

Hi,guys
I met a problem, the error message is "Object reference not set to an instance of an object." ,which indicating the * row has this problem. I really don't understand, please help me!
Bellow is my code:

private void BindTypeData(){
string query = "select * from tblFacilityType";
sqlDataAdapter = new SqlDataAdapter(query,sqlConnection);
ds = new DataSet();
sqlDataAdapter.Fill(ds,"tblFacilityType");
* FacilityDataGrid.DataSource = ds.Tables["tblFacilityType"];
FacilityDataGrid.DataBind();
}

Thanks first!

feiMake sure that sqlConnection and FacilityDataGrid are instantiated somewhere else.|||hi,jason
I've checked, it is there. But i still have the same problem!

public class __FacilityType : System.Web.UI.UserControl
{
protected DataSet ds;
protected SqlConnection sqlConnection;
protected SqlDataAdapter sqlDataAdapter;
protected SqlCommand sqlSelectCommand;
protected SqlCommand sqlInsertCommand;
protected Panel FacilityTypePanel;
protected DataGrid FacilityTypeDataGrid;
protected SqlDataReader reader;

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
if(!Page.IsPostBack){
BindTypeData();
}
}
//Todo: bind data for the facility list datagrid
private void BindTypeData(){
string query = "select * from tblFacilityType";
sqlDataAdapter = new SqlDataAdapter(query,sqlConnection);
ds = new DataSet();
sqlDataAdapter.Fill(ds,"tblFacilityType");
FacilityTypeDataGrid.DataSource = ds.Tables["tblFacilityType"];
FacilityTypeDataGrid.DataBind();
}|||Where and how are u instantiating sqlConnection?

"Command text was not set for the command object" Error

Hi. I am writing a program in C# to migrate data from a Foxpro database to an SQL Server 2005 Express database. The package is being created programmatically. I am creating a separate data flow for each Foxpro table. It seems to be doing it ok but I am getting the following error message at the package validation stage:

Description: An OLE DB Error has occured. Error code: 0x80040E0C.

An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E0C Description: "Command text was not set for the command object".

.........

Description: "component "OLE DB Destination" (22)" failed validation and returned validation status "VS_ISBROKEN".

This is the first time I am writing such code and I there must be something I am not doing correct but can't seem to figure it out. Any help will be highly appreciated. My code is as below:

private bool BuildPackage()

{

// Create the package object

oPackage = new Package();

// Create connections for the Foxpro and SQL Server data

Connections oPkgConns = oPackage.Connections;

// Foxpro Connection

ConnectionManager oFoxConn = oPkgConns.Add("OLEDB");

oFoxConn.ConnectionString = sSourceConnString; // Created elsewhere

oFoxConn.Name = "SourceConnectionOLEDB";

oFoxConn.Description = "OLEDB Connection For Foxpro Database";

// SQL Server Connection

ConnectionManager oSQLConn = oPkgConns.Add("OLEDB");

oSQLConn.ConnectionString = sTargetConnString; // Created elsewhere

oSQLConn.Name = "DestinationConnectionOLEDB";

oSQLConn.Description = "OLEDB Connection For SQL Server Database";

// Add Prepare SQL Task

Executable exSQLTask = oPackage.Executables.Add("STOCK:SQLTask");

TaskHost thSQLTask = exSQLTask as TaskHost;

thSQLTask.Properties["Connection"].SetValue(thSQLTask, "oSQLConn");

thSQLTask.Properties["DelayValidation"].SetValue(thSQLTask, true);

thSQLTask.Properties["ResultSetType"].SetValue(thSQLTask, ResultSetType.ResultSetType_None);

thSQLTask.Properties["SqlStatementSource"].SetValue(thSQLTask, @."C:\LPFMigrate\LPF_Script.sql");

thSQLTask.Properties["SqlStatementSourceType"].SetValue(thSQLTask, SqlStatementSourceType.FileConnection);

thSQLTask.FailPackageOnFailure = true;

// Add Data Flow Tasks. Create a separate task for each table.

// Get a list of tables from the source folder

arFiles = Directory.GetFileSystemEntries(sLPFDataFolder, "*.DBF");

for (iCount = 0; iCount <= arFiles.GetUpperBound(0); iCount++)

{

// Get the name of the file from the array

sDataFile = Path.GetFileName(arFiles[iCount].ToString());

sDataFile = sDataFile.Substring(0, sDataFile.Length - 4);

oDataFlow = ((TaskHost)oPackage.Executables.Add("DTS.Pipeline.1")).InnerObject as MainPipe;

oDataFlow.AutoGenerateIDForNewObjects = true;

// Create the source component

IDTSComponentMetaData90 oSource = oDataFlow.ComponentMetaDataCollection.New();

oSource.Name = (sDataFile + "Src");

oSource.ComponentClassID = "DTSAdapter.OLEDBSource.1";

// Get the design time instance of the component and initialize the component

CManagedComponentWrapper srcDesignTime = oSource.Instantiate();

srcDesignTime.ProvideComponentProperties();

// Add the connection manager

if (oSource.RuntimeConnectionCollection.Count > 0)

{

oSource.RuntimeConnectionCollection[0].ConnectionManagerID = oFoxConn.ID;

oSource.RuntimeConnectionCollection[0].ConnectionManager = DtsConvert.ToConnectionManager90(oFoxConn);

}

// Set Custom Properties

srcDesignTime.SetComponentProperty("AccessMode", 0);

srcDesignTime.SetComponentProperty("AlwaysUseDefaultCodePage", true);

srcDesignTime.SetComponentProperty("OpenRowset", sDataFile);

// Re-initialize metadata

srcDesignTime.AcquireConnections(null);

srcDesignTime.ReinitializeMetaData();

srcDesignTime.ReleaseConnections();

// Create Destination component

IDTSComponentMetaData90 oDestination = oDataFlow.ComponentMetaDataCollection.New();

oDestination.Name = (sDataFile + "Dest");

oDestination.ComponentClassID = "DTSAdapter.OLEDBDestination.1";

// Get the design time instance of the component and initialize the component

CManagedComponentWrapper destDesignTime = oDestination.Instantiate();

destDesignTime.ProvideComponentProperties();

// Add the connection manager

if (oDestination.RuntimeConnectionCollection.Count > 0)

{

oDestination.RuntimeConnectionCollection[0].ConnectionManagerID = oSQLConn.ID;

oDestination.RuntimeConnectionCollection[0].ConnectionManager = DtsConvert.ToConnectionManager90(oSQLConn);

}

// Set custom properties

destDesignTime.SetComponentProperty("AccessMode", 2);

destDesignTime.SetComponentProperty("AlwaysUseDefaultCodePage", false);

destDesignTime.SetComponentProperty("OpenRowset", "[dbo].[" + sDataFile + "]");

// Create the path to link the source and destination components of the dataflow

IDTSPath90 dfPath = oDataFlow.PathCollection.New();

dfPath.AttachPathAndPropagateNotifications(oSource.OutputCollection[0], oDestination.InputCollection[0]);

// Iterate through the inputs of the component.

foreach (IDTSInput90 input in oDestination.InputCollection)

{

// Get the virtual input column collection

IDTSVirtualInput90 vInput = input.GetVirtualInput();

// Iterate through the column collection

foreach (IDTSVirtualInputColumn90 vColumn in vInput.VirtualInputColumnCollection)

{

// Call the SetUsageType method of the design time instance of the component.

destDesignTime.SetUsageType(input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READWRITE);

}

//Map external metadata to the inputcolumn

foreach (IDTSInputColumn90 inputColumn in input.InputColumnCollection)

{

IDTSExternalMetadataColumn90 externalColumn = input.ExternalMetadataColumnCollection.New();

externalColumn.Name = inputColumn.Name;

externalColumn.Precision = inputColumn.Precision;

externalColumn.Length = inputColumn.Length;

externalColumn.DataType = inputColumn.DataType;

externalColumn.Scale = inputColumn.Scale;

// Map the external column to the input column.

inputColumn.ExternalMetadataColumnID = externalColumn.ID;

}

}

}

// Add precedence constraints to the package executables

PrecedenceConstraint pcTasks = oPackage.PrecedenceConstraints.Add((Executable)thSQLTask, oPackage.Executables[0]);

pcTasks.Value = DTSExecResult.Success;

for (iCount = 1; iCount <= (oPackage.Executables.Count - 1); iCount++)

{

pcTasks = oPackage.PrecedenceConstraints.Add(oPackage.Executables[iCount - 1], oPackage.Executables[iCount]);

pcTasks.Value = DTSExecResult.Success;

}

// Validate the package

DTSExecResult eResult = oPackage.Validate(oPkgConns, null, null, null);

// Check if the package was successfully executed

if (eResult.Equals(DTSExecResult.Canceled) || eResult.Equals(DTSExecResult.Failure))

{

string sErrorMessage = "";

foreach (DtsError pkgError in oPackage.Errors)

{

sErrorMessage = sErrorMessage + "Description: " + pkgError.Description + "\n";

sErrorMessage = sErrorMessage + "HelpContext: " + pkgError.HelpContext + "\n";

sErrorMessage = sErrorMessage + "HelpFile: " + pkgError.HelpFile + "\n";

sErrorMessage = sErrorMessage + "IDOfInterfaceWithError: " + pkgError.IDOfInterfaceWithError + "\n";

sErrorMessage = sErrorMessage + "Source: " + pkgError.Source + "\n";

sErrorMessage = sErrorMessage + "Subcomponent: " + pkgError.SubComponent + "\n";

sErrorMessage = sErrorMessage + "Timestamp: " + pkgError.TimeStamp + "\n";

sErrorMessage = sErrorMessage + "ErrorCode: " + pkgError.ErrorCode;

}

MessageBox.Show("The DTS package was not built successfully because of the following error(s):\n\n" + sErrorMessage, "Package Builder", MessageBoxButtons.OK, MessageBoxIcon.Information);

return false;

}

// return a successful result

return true;

}

So the OLE-DB Destination is not happy and I cannot see anything obvious. A better way to debug this would be to just add a Save method before validation to save your package to disk. You can then open it in Visual Studio/BIDS, and enjoy the full GUI experience to help find the problem. I've found this method very useful for just checking packages when building programmatically.

|||

I have inserted code to save the package just before the validation but it throws an exception. And I don't find the help in MSDN very useful!! I want to save the package in the folder C:\LPFMigrate and call it Package.dtsx. The code is as follows:

oApp = new Microsoft.SqlServer.Dts.Runtime.Application();

oApp.SaveToDtsServer(oPackage, null, @."C:\LPFMigrate\Package", "MARS");

Any idea why an exception is being thrown? The exception message is:

The server threw an exception. (Exception from HRESULT: 0x80010105 (RPC_E_SERVERFAULT))