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Can I have data from two different sources into a single dataset?

Posted By :Shashi Ray     Posted Date :December 08, 2009    Points :10   Category :.NET Framework 
Yes, it is possible.

You can also find related Interview Question to Can I have data from two different sources into a single dataset?  below: 

What is the difference between Data Reader & Dataset?

  
Data Reader is connected datasource, read only, forward only record set.

Dataset is disconnected datatsource resides in memory database that can store multiple tables, relations and constraints; (More...)

You are working with a DataSet and want to be able to display data, sorted different ways. How do you do so?

  
Select the correct answer.

1. Use the Sort method on the DataTable object.
2. Use the DataSet object's Sort method.
3. Use a DataView object for each sort.
4. Create a DataTable for each sort, using the DataTable object's Copy method, and then Sort the result


Correct Answer is :
3. Use a DataView object for each sort. (More...)

Explain the steps involved to populate dataset with data?

  
Open connection.;
Initialize Adapter passing SQL and connection as parameter.;
Initialize Dataset.;
Call Fill method of the adapter passes dataset as the parameter.;
Close connection.; (More...)

Is it possible to have tables in the dataset that are not bound to any data source?

  
Yes, I can create table object in code and add it to the dataset. (More...)

How to fill DataSet with data?

  
To fill DataSet with data we have to use Fill() method of DataAdapter object.

Fill() has several overloads. But the simple one is
[CODE]Fill(DataSet, DataTable)[/CODE]
The first parameter will take the name of the dataset to be filled and the second parameter specifies the name of the DataTable in the DataSet which will contain the data. (More...)

Populate multiple controls from DB in a single function using a single DataSet

  
Step 1:
- Write the different queries for getting the data from the DB for different controls in a single string variable by separating them with semicolon.

Ex -
//Create the SQL query.
string selectQueryForControlPopulation =
"SELECT COL1,COL2,... FROM TABLE_NAME1 WHERE CONDITION; SELECT COL1,COL2,..FROM TABLE_NAME2 WHERE CONDITION; ......";
Step 2:
- Create the DataAdapter, DataSet object. Execute the query and fill the DataSet object.

Ex -
//Create the Connection object.
OleDbConnection oConnection = new OleDbConnection(ConfigurationSettings.AppSettings["SQLConnectionString"]);

//Create the Command object.
OleDbCommand oCommand = new OleDbCommand(selectQueryForControlPopulation , oConnection );

//Create the DataAdapter object and set its property.
OleDbDataAdapter oAdapter = new OleDbDataAdapter();
oAdapter .SelectCommand = oCommandPopulateOrganizations;

// Create a DataSet object.
DataSet oDataSet = new DataSet();

//Filling the DataSet object.
oAdapter .Fill(oDataSet);

(**) The DataSet object contain the result of different queries as different tables. We can access those table to fill our controls.

http://www.mindfiresolutions.com/Populate-multiple-controls-from-DB-in-a-single-function-using-a-single-DataSet-831.php (More...)

How can you clear a Data from all the table in the dataset?

  
using Dataset.Clear() method you can clear all the data from DataSet (More...)

can we connect two dataadapters to same data source using single connection at same time?

  
yes,we can connect two dataadapters to same datasource using single connection at same time.
There is a technology in ado.net 2.0 called MARS usinng Mars in connection string we can do it.
for eg:
cn.ConnectionString = "server=(local); database=employee; integrated security=sspi; MultipleActiveResultSets=True"; (More...)

Can we have a message contract as input parameter and data contract as returned parameter in a single operation contract?

  
No, Input and return parameter should be same as Message contract if we want to use message contract in a operation contract. (More...)

What is typed dataset in C#?

  
A typed dataset is similar to a dataset with only difference is that the sehema is already present in typed dataset. so if any mismatch in the column will generate compile time errors rather than runtime error as in the case of normal dataset. Also accessing the column value is much easier than the normal dataset as the column definition will be available in the schema. (More...)

What happens when we issue Dataset.ReadXml command?

  
Reads XML schema and data into the DataSet. (More...)

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