allowDBNullvalues and to constrain values to be unique. However, if you define theCustIDcolumn as the primary key column of the table, theAllowDBNullproperty will automatically be set tofalseand theUniqueproperty will automatically be set totrue. For more information, seeDefining Primary Keys (...
Passing an array of values, typed asObject, to theAddmethod creates a new row inside the table and sets its column values to the values in the object array. Note that values in the array are matched sequentially to the columns, based on the order in which they appear in the table. ...
In the example, notice that the properties for the CustID column are set to not allow DBNull values and to constrain values to be unique. However, if you define the CustID column as the primary key column of the table, the AllowDBNull property will automatically be set to fal...
We fill the DataSet with second DataTable called orders In order to set relationship between two tables we need to have a common key field between them. In our case customerid is such a field. We then create an instance of DataRelation class that represents a relation between tables We pas...
You can then set the DisplayMember and ValueMember properties to draw the displayed text and values from that object. To add a text/value pair to the control you would have to add it to the object it was bound to. Look up the help topics for the DataSource, DisplayMember and ValueMemb...
column name, you can use ColumnIndex too, however it is not suggested as you might want to add a column in the mid of the table then you will need to change your code wherever you have specified the index of the column. Same applies while reading or writing values into Data...
// declare a variable to hold a DataRow object DataRow objDataRow; // create a new DataRow object instance in this table objDataRow = objTable.NewRow(); // and fill in the values objDataRow["ISBN"] = "1234567800"; objDataRow["Title"] = "Professional Video Recorder Programming"; ...
((IDictionary)row)[labels[i].Replace(' ', '_')] = values[i]; dataGrid.Items.Add(row); //edit: Please be aware that although this method simplifies the process when dealing with programmatically generated data (such as a sequence of features and output), it is not the recommended way ...
TheAddingNewDataItemevent is raised before a new row is added to RadGridView. A typical use case would be when you have to set initial values for an initialized object. You can do this by passing an object to theGridViewAddingNewEventArgs'sNewObjectproperty. ...
ADO.NET enables you to create DataTable objects and add them to an existing DataSet. You can set constraint information for a DataTable by using the PrimaryKey and Unique properties.ExampleThe following example constructs a DataSet, adds a new DataTable object to the DataSet, and then adds ...