C# ode>ALTER PROCEDURE语句，以便保存更改？因为代码可以工作（我刚刚测试过）。嗯，你确定Request.QueryString[DropDownList1.SelectedValue.ToString（）]不应该只是DropDownList1

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ode>ALTER PROCEDURE语句，以便保存更改？因为代码可以工作（我刚刚测试过）。嗯，你确定

Request.QueryString[DropDownList1.SelectedValue.ToString（）]

不应该只是

DropDownList1.SelectedValue.ToString（）

？（请参阅我的更新）好的，现在我在选择一封信时出现了一个错误。用户代码未处理HTTPException。错误发生在CustomerRepeater.DataBind（）上，它表示System.Data.DataRowView不包含名为“CustomerID”的属性。什么？！为什么它返回CustomerID

SELECT *
FROM CUSTOMER
WHERE LEFT(NAME, 1) = 'A'

CREATE PROCEDURE [dbo].[procCustomer_SelectByFirstLetter]
    @SearchTerm VARCHAR(50)
AS
SELECT  [Name]

FROM    [dbo].[Customer]
WHERE   LEFT(NAME, 1) = '@SearchTerm'
GO

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {


            DataTable customerTable =  Customer.SelectByFirstLetter(Request.QueryString[DropDownList1.SelectedValue.ToString()]);
            CustomerRepeater.DataSource = customerTable;
            CustomerRepeater.DataBind();
            CustomerCountLabel.Text = customerTable.Rows.Count.ToString();            
    }

WHERE LEFT(NAME, 1) = @SearchTerm

WHERE NAME LIKE 'A%'

WHERE NAME LIKE @SearchTerm + '%'

DataTable customerTable = Customer.SelectByFirstLetter(Request.QueryString[DropDownList1.SelectedValue.ToString()]);

DataTable customerTable = Customer.SelectByFirstLetter(DropDownList1.SelectedValue.ToString());

LEFT(NAME, 1) = @SearchTerm 

LEFT(NAME, 1) = '@SearchTerm' 

CREATE PROCEDURE [dbo].[procCustomer_SelectByFirstLetter]
    @SearchTerm VARCHAR(50)
AS
SELECT  [Name]

FROM    [dbo].[Customer]
WHERE   LEFT(NAME, LEN(@SearchTerm)) = @SearchTerm

Customer.SelectByFirstLetter(Request.QueryString[DropDownList1.SelectedValue.ToString()]);

Customer.SelectByFirstLetter(DropDownList1.SelectedValue.ToString());

CREATE PROCEDURE [dbo].[procCustomer_SelectByFirstLetter]
    @SearchTerm CHAR(1)  
AS  
    SELECT 
              [Name]
        FROM    
              [dbo].[Customer]  
        WHERE   
              LEFT(NAME, 1) = @SearchTerm
GO

CREATE PROCEDURE [dbo].[procCustomer_SelectByNameStart]
    @SearchTerm VARCHAR(MAX) /*Use your column width here*/
AS  
    SELECT 
              [Name]
        FROM    
              [dbo].[Customer] C
        WHERE   
              C.[Name] LIKE @SearchTerm + '%'
GO

if (!Page.IsPostback)
{
}