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hi guys
im working on an web site but wonderfully i cant update data here is my code:
int result = SqlHelper.ExecuteNonQuery(SqlHelper.CreateCommand("UpdateArticle", CommandType.StoredProcedure,
new SqlParameter("@ID", long.Parse(Request.QueryString["ArticleID"])),
new SqlParameter("@CategoryTitle",                                                                           this.Category.SelectedItem.Text),
new SqlParameter("@Title", this.ArticleTitle.Text),
new SqlParameter("@Summary", this.ArticleSummary.Text),
new SqlParameter("@UserName", Context.User.Identity.Name),
new SqlParameter("@IsTmb", this.Tmb.Checked),
new SqlParameter("@IsDailty", this.Daily.Checked),
new SqlParameter("@TmbPhotoID", long.Parse(TmbPhotoID.Text)),
new SqlParameter("@Body", this.Editor.Text)
        this.InfoLabel.Text = result == 1 ? "Update successfully" : "Failed";

My helper class and my connection string is very tested and here is my mark up:
<div class="InsertItemContainer">
                 <label for="Category">Category:</label>

and something even more wondefully is some times when i replace the "this.ArticleTitle.Text with an absolute string is works @-@ no exception is thrown. except some times "Cannot have multiple items selected in a DropDownList." is thrown as exception.
and here is my procedure:

USE [WebServices]
/****** Object:  StoredProcedure [dbo].[UpdateArticle]    Script Date: 9/7/2014 5:11:14 PM ******/
ALTER	Procedure	[dbo].[UpdateArticle]
@ID						BigInt,
@CategoryTitle			nVarChar(300),
@UserName				nVarChar(300),
@Title					nVarChar(600),
@IsTmb					bit,
@IsDaily				bit,
@Summary				nVarChar(Max),
@Body					nVarChar(Max),
@TmbPhotoID				BigInt
Declare		@CategoryID	as	BigInt
Declare		@UserID		as	UniqueIdentifier	
Select	@UserID	=	
		Select	UserID	from	aspnet_Users	Where	UserName	=	@UserName
	Select	@CategoryID	=	
		Select	ID	From	Category	Where	Category.Title	=	@CategoryTitle
	begin try
	Update	Article
		Set		CategoryID = @CategoryID,
				UserID =	@UserID,
				IsTmb = @IsTmb,
				IsDaily = @IsDaily,
				Body = @Body,
				Title = @Title,
				Summary = @Summary,
				TmbPhotoID = @TmbPhotoID
				Where	ID	=	@ID
				return 1
	end try
	begin catch
		return 0
	end catch

thanks any one who read or help Smile | :)
Posted 7-May-13 4:04am
Edited 7-May-13 5:01am
Pheonyx 7-May-13 9:05am
You said "no exception is thrown. " when you use an absolute string... what exception is thrown when you don't?
RedSakura 7-May-13 9:13am
it just update the title and thats all no exceptions @.@
KM Perumal 7-May-13 9:07am
where is parameter of body????
CHill60 7-May-13 9:56am
new SqlParameter("UserName", Context.User.Identity.Name), - should that be "@Username" ?
RedSakura 7-May-13 10:02am
that was copy paste failure :D
in my code its @UserName but still dosnt work...
Tadit Dash 7-May-13 12:42pm
Which is a dropdown ? Is "ArticleTitle" a dropdown ?
RedSakura 7-May-13 13:30pm
the category is a dropdown.
ArticleTitle is a TextBox

1 solution

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Solution 1

It is DataBinding problem of the DropDown.

If you are binding the same DataSource with multiple DropDownLists or when the same ListItem is binded to multiple DropDownLists, then this error may come.

Quick Fix

A quick fix is to clear the selection of DropDown before reading its currently selected value like below...
Refer- ASP.NET Tips: DropDownList.ClearSelection() to avoid "Cannot have multiple items selected in DropDownList"[^]

Permanent Solution

If you want to fix the root cause of the problem, then check whether the DataBind or ListItems are duplicated in multiple DropDowns. For that always create new instance of ListItem, don't reuse the previous instance.

Refer- Cannot have multiple items selected in a DropDownList[^]

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