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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlcommand.commandtype below:

SqlCommand.CommandType Property (System.Data.SqlClient) | Microsoft Learn

SqlCommand.CommandType Property Definition

Gets or sets a value indicating how the CommandText property is to be interpreted.

public:
 virtual property System::Data::CommandType CommandType { System::Data::CommandType get(); void set(System::Data::CommandType value); };

public:
 property System::Data::CommandType CommandType { System::Data::CommandType get(); void set(System::Data::CommandType value); };

public override System.Data.CommandType CommandType { get; set; }

[System.Data.DataSysDescription("DbCommand_CommandType")]
public System.Data.CommandType CommandType { get; set; }

member this.CommandType : System.Data.CommandType with get, set

[<System.Data.DataSysDescription("DbCommand_CommandType")>]
member this.CommandType : System.Data.CommandType with get, set

Public Overrides Property CommandType As CommandType

Public Property CommandType As CommandType

Property Value

One of the CommandType values. The default is Text.

Implements

Attributes

Exceptions Examples

The following example creates a SqlCommand and sets some of its properties.

public void CreateSqlCommand()
{
   SqlCommand command = new SqlCommand();
   command.CommandTimeout = 15;
   command.CommandType = CommandType.Text;
}

Public Sub CreateSqlCommand()
    Dim command As New SqlCommand()
    command.CommandTimeout = 15
    command.CommandType = CommandType.Text
End Sub

Remarks

When you set the CommandType property to StoredProcedure, you should set the CommandText property to the name of the stored procedure. The command executes this stored procedure when you call one of the Execute methods.

The Microsoft .NET Framework Data Provider for SQL Server does not support the question mark (?) placeholder for passing parameters to a SQL Statement or a stored procedure called with a CommandType of Text. In this case, named parameters must be used. For example:

SELECT * FROM Customers WHERE CustomerID = @CustomerID

For more information, see Configuring Parameters and Parameter Data Types.