ASP.NET，SQL Server 2008 R2，System.OverflowException

我想使用存儲過程在SQL Server 2008 R2表中插入一條記錄。我正在「試圖」爲數據庫訪問編寫一個通用類。ASP.NET，SQL Server 2008 R2，System.OverflowException

下面是.VB文件中的代碼：

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load 
    If PreviousPage IsNot Nothing AndAlso PreviousPage.IsCrossPagePostBack Then 
     Dim params(5) As SqlParameter 
     params(0) = New SqlParameter("@Name", PreviousPage.Name.Text) 
     params(1) = New SqlParameter("@Qualification", PreviousPage.Qualification.Text) 
     params(2) = New SqlParameter("@ContactNo", PreviousPage.ContactNo.Text) 
     params(3) = New SqlParameter("@Expertise", PreviousPage.Expertise.Text) 
     params(4) = New SqlParameter("@Comments", PreviousPage.Comments.Text) 
     params(5) = New SqlParameter("@Affiliation", PreviousPage.Affiliation.Text) 
     DAL.DoInsertSP(params) 
    End If 
End Sub

下面是DAL.DoInsertSP（）的代碼：

Public Shared Function DoInsertSP(ByRef params As Array) As Byte 
    Dim result As Byte = 0 
    CreateConnection() 
    cmd = New SqlCommand("sp_InsertExpert", conn) 
    cmd.CommandType = CommandType.StoredProcedure 
    cmd.Parameters.AddRange(params) 
    Try 
     result = CByte(cmd.ExecuteNonQuery()) 
    Catch ex As Exception 
     conn.Dispose() 
    End Try 
    Return result 
End Function

的代碼拋出System.OverflowException：算術運算導致溢出。

這裏的PROC腳本sp_InsertExpert

USE [dbherpes]

GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [DBO]。[sp_InsertExpert]
@Name nvarchar（30）= null，
@Qualification爲nvarchar（40）=零，
@ContactNo爲nvarchar（13）=零，
@Expertise爲nvarchar（30）=零，
@Comments爲nvarchar（100）=零，
@Affiliation爲nvarchar（50 ）= null AS
BEGIN
SET NOCOUNT ON;
INSERT INTO專家（名稱，資質，ContactNo，專業知識，評論，所屬）VALUES（@Name，@Qualification，@ContactNo，@Expertise，@Comments，@Affiliation）
END

這裏的結構表：

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