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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.linq.mapping.columnattribute.dbtype below:

ColumnAttribute.DbType Property (System.Data.Linq.Mapping) | Microsoft Learn

ColumnAttribute.DbType Property Definition

Gets or sets the type of the database column.

public:
 property System::String ^ DbType { System::String ^ get(); void set(System::String ^ value); };

public string DbType { get; set; }

member this.DbType : string with get, set

Public Property DbType As String

Property Value

String value that specifies the exact text that defines the column in a Transact-SQL table declaration.

Examples

[Column(Storage="_FirstName", DbType="NVarChar(10) NOT NULL", CanBeNull=false)]
public string FirstName
{
    get
    {
        return this._FirstName;
    }
    set
    {
        if ((this._FirstName != value))
        {
            this.OnFirstNameChanging(value);
            this.SendPropertyChanging();
            this._FirstName = value;
            this.SendPropertyChanged("FirstName");
            this.OnFirstNameChanged();
        }
    }
}

<Column(Storage:="_FirstName", DbType:="NVarChar(10) NOT NULL", CanBeNull:=false)>  _
Public Property FirstName() As String
    Get
        Return Me._FirstName
    End Get
    Set
        If ((Me._FirstName = value)  _
                    = false) Then
            Me.OnFirstNameChanging(value)
            Me.SendPropertyChanging
            Me._FirstName = value
            Me.SendPropertyChanged("FirstName")
            Me.OnFirstNameChanged
        End If
    End Set
End Property

Remarks

Use this property to specify the exact text that defines the column in a Transact-SQL table declaration. Specify the DbType property only if you plan to use CreateDatabase to create an instance of the database.

The default value of DbType is inferred from the member type. For more information, see SQL-CLR Type Mapping.

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