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SqlParameter Constructor (String, SqlDbType, Int32, ParameterDirection, Boolean, Byte, Byte, String, DataRowVersion, Object)

Initializes a new instance of the SqlParameter class that uses the parameter name, the type of the parameter, the size of the parameter, a ParameterDirection, the precision of the parameter, the scale of the parameter, the source column, a DataRowVersion to use, and the value of the parameter.

Namespace: System.Data.SqlClient
Assembly: System.Data (in

public SqlParameter (
	string parameterName,
	SqlDbType dbType,
	int size,
	ParameterDirection direction,
	bool isNullable,
	byte precision,
	byte scale,
	string sourceColumn,
	DataRowVersion sourceVersion,
	Object value
public SqlParameter (
	String parameterName, 
	SqlDbType dbType, 
	int size, 
	ParameterDirection direction, 
	boolean isNullable, 
	byte precision, 
	byte scale, 
	String sourceColumn, 
	DataRowVersion sourceVersion, 
	Object value
public function SqlParameter (
	parameterName : String, 
	dbType : SqlDbType, 
	size : int, 
	direction : ParameterDirection, 
	isNullable : boolean, 
	precision : byte, 
	scale : byte, 
	sourceColumn : String, 
	sourceVersion : DataRowVersion, 
	value : Object



The name of the parameter to map.


One of the SqlDbType values.


The length of the parameter.


One of the ParameterDirection values.


true if the value of the field can be null; otherwise false.


The total number of digits to the left and right of the decimal point to which Value is resolved.


The total number of decimal places to which Value is resolved.


The name of the source column.


One of the DataRowVersion values.


An Object that is the value of the SqlParameter.

Exception typeCondition


The value supplied in the dbType parameter is an invalid back-end data type.

The Size and Precision are inferred from the value of the dbType parameter if they are not explicitly set in the size and precision parameters.

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

private static void AddSqlParameter(SqlCommand command)
    SqlParameter parameter = new SqlParameter("@Description", 
        SqlDbType.VarChar, 11, ParameterDirection.Input,
        true, 0, 0, "Description", DataRowVersion.Current, 
        "garden hose");
    parameter.IsNullable = true;


Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0