Develop Reference

displaying images from a folder in a gridView ASP.NET

How can I display images in GridView from a folder in my project?
Iv'e tried to create an image/imageField dynamically, but it didn't work- I don't know how to connect the images to the imageField in my GridView, and that's my main problem.
How can I do it?
Here's my GridView:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
Height="271px" onselectedindexchanged="GridView1_SelectedIndexChanged"
style="font-family: Arial, Helvetica, sans-serif" Width="452px">
<Columns>
<asp:BoundField DataField="messageSubject" HeaderText="subject" />
<asp:BoundField DataField="messageContent" HeaderText="content" />
<asp:BoundField DataField="wasReadOrNot" HeaderText="was read" />
<asp:ImageField HeaderText="image">
</asp:ImageField>
</Columns>
</asp:GridView>
(In addition, it's okay to use imageField at all?)
And here's my Code Behind:
protected void Page_Load(object sender, EventArgs e)
{
Page.MaintainScrollPositionOnPostBack = true;
if (!IsPostBack)
{
WebServiceDBMessages.WebServiceDBMessagesSoapClient dbm = new WebServiceDBMessages.WebServiceDBMessagesSoapClient();
DataTable dt = dbm.ReturnAllMessagesForTeacher(Session["teacher"].ToString()).Tables[0];
for (int i = 0; i < GridView1.Rows.Count; i++)
{
if (GridView1.Rows[i].Cells[3].Text == "not read")
{
//here i want to display image whose url is: "/images/notRead.png"
}
else
{
//here i want to display image whose url is: "/images/read.png"
}
}
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
Thanks(:

The image url is not in the dataset so can change your GridView definition to
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
Height="271px" onselectedindexchanged="GridView1_SelectedIndexChanged"
style="font-family: Arial, Helvetica, sans-serif" Width="452px" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:BoundField DataField="messageSubject" HeaderText="subject" />
<asp:BoundField DataField="messageContent" HeaderText="content" />
<asp:BoundField DataField="wasReadOrNot" HeaderText="was read" />
<asp:TemplateField HeaderText="image">
<ItemTemplate>
<asp:Image runat="server" ID="img" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Change your page load to
protected void Page_Load(object sender, EventArgs e)
{
Page.MaintainScrollPositionOnPostBack = true;
if (!IsPostBack)
{
WebServiceDBMessages.WebServiceDBMessagesSoapClient dbm = new WebServiceDBMessages.WebServiceDBMessagesSoapClient();
DataTable dt = dbm.ReturnAllMessagesForTeacher(Session["teacher"].ToString()).Tables[0];
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
Add following
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
var image = e.Row.FindControl("img") as Image;
image.ImageUrl = e.Row.Cells[3].Text == "not read" ? "/images/notRead.png" : "/images/read.png";
}
}
This should accomplish what you are trying to do.

Getting data from gridview to textbox in asp.net c# using link button

Here is my aspx.cs page code. Every time when I run the code the only answer I get is: Column name doesn't exist.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"
CssClass="table table-striped table-bordered table-hover" >
<Columns>
<asp:BoundField DataField="TutorialId" HeaderText="Tutorial Id"/>
<asp:BoundField DataField="TutorialTitle" HeaderText="TutorialTitle"/>
<asp:BoundField DataField="CatId" HeaderText="Category Id" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkview" runat="server" OnClick="lnk_OnClick"
CommandArgument='<%#Eval("TutorialId") %>'>View</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And here is my aspx code. Here I have used click event on the link
button which is getting the ID number:
protected void lnk_OnClick(object sender, EventArgs e)
{
int TutorialId = Convert.ToInt32((sender as LinkButton).CommandArgument);
GetTutorialById();
}
private void GetTutorialById()
{
OnlineSubjects onlinesubject = new OnlineSubjects();
DataTable dTable = onlinesubject.GetTutorialById();
txtTutId.Text = dTable.Rows[0]["TutorialId"].ToString();
txtTitle.Text = dTable.Rows[0]["TutorialTitle"].ToString();
txtAddTutorial.Text = dTable.Rows[0]["TutorialDesc"].ToString();
}
public DataTable GetTutorialById()
{
SqlParameter[] parameters = new SqlParameter[1];
parameters[0] = DataLayer.DataAccess.AddParameter(
"#TutorialId", TutorialId, System.Data.SqlDbType.Int, 100);
DataTable dTable = DataLayer.DataAccess.ExecuteDTByProcedure(
"spTutorialViewById", parameters);
return dTable;
}

How to bind data in checkbox list in Gridview with same datatable?

I want to give checkbox list in Gridview. How can I bind data to checkbox list from same data table?

What i understood that i am showing let me know you are asking for the same or not
This is the design portion
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" CssClass="gridview"
>
<Columns>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="name" runat="server" Text='<%#Eval("Name")%>'>></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Roll No">
<ItemTemplate>
<asp:Label ID="rollno" runat="server" Text='<%#Eval("Roll_No")%>'>></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Gender">
<ItemTemplate>
<asp:CheckBox runat="server" Text='<%#Eval("Gender")%>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>
Here I have made a temoporary data table you can make data table through database also
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
check_box();
}
}
public void check_box() {
DataTable dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("Roll_NO");
dt.Columns.Add("Gender");
dt.Rows.Add();
dt.Rows[0][0]="Prateek Ghosh";
dt.Rows[0][1] = 123;
dt.Rows[0][2] = "Male";
dt.Rows.Add();
dt.Rows[1][0] = "Rahul";
dt.Rows[1][1] = 1234;
dt.Rows[1][2] = "Male";
dt.Rows.Add();
dt.Rows[2][0] = "Neha";
dt.Rows[2][1] = 12345;
dt.Rows[2][2] = "Female";
GridView1.DataSource = dt;
GridView1.DataBind();
}

HyperLink to specific item in gridview row

So I am working on a basketball website. There is a gridview full of teams and what I would like is when you click on a team name, it links you to a new page that has info about the team. What I tried so far only links every team to the same details page.
Here is my gridview code:
<asp:GridView ID="GridView1" runat="server" AllowSorting="True"
AutoGenerateColumns="False" CellPadding="4" DataKeyNames="Team"
DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None"
Height="340px" Width="776px">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:HyperLinkField DataTextField="Team" DataNavigateUrlFields="Rank" DataNavigateUrlFormatString="~/MemberPages/Details.aspx?Rank={0}"
HeaderText="Team" SortExpression="Team" ItemStyle-Width = "150" >
<ItemStyle Width="150px"></ItemStyle>
</asp:HyperLinkField>
<asp:BoundField DataField="Rank" HeaderText="Rank" SortExpression="Rank" />
<asp:BoundField DataField="PointsPerGame" HeaderText="PointsPerGame"
SortExpression="PointsPerGame" />
<asp:BoundField DataField="OpponentPointsPerGame"
HeaderText="OpponentPointsPerGame" SortExpression="OpponentPointsPerGame" />
<asp:BoundField DataField="TopPlayer" HeaderText="TopPlayer"
SortExpression="TopPlayer" />
</Columns>
</asp:GridView>
And here is what I tried in the cs file to databind them to a specific link:
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[5] { new DataColumn("Team"),new DataColumn("Ranking"), new DataColumn("PointsPerGame"),
new DataColumn("OpponentPointsPerGame"), new DataColumn("TopPlayer")});
GridView1.DataBind();
}
}

For that kind of show/hide logic on specific row, you will need to use GridView.RowDataBound event.
Use a TemplateField instead of BoundField.
Place HyperLink control inside.
Then retrieve the HyperLink control inside RowDataBound event.
Example Code
<asp:TemplateField>
<ItemTemplate>
<asp:HyperLink runat="server" ID="MyHyperLink" Text="My Text" />
</ItemTemplate>
</asp:TemplateField>
protected void GridView1_RowDataBound(
Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
var myHyperLink = e.Row.FindControl("MyHyperLink") as HyperLink;
if(SOME_LOGIC)
{
myHyperLink.Visible = false;
}
}
}

gridview databinding problems

Trying to figure out why I'm having a problem getting GridView1 to databind
HTML:
<asp:GridView ID="GridView1" runat="server" AllowSorting="True"
AutoGenerateColumns="False" DataSourceID="SqlDataSource1"
CellPadding="10" RowStyle-VerticalAlign="Top"
BackColor="White" BorderColor="Black" BorderWidth="1px" OnRowCreated="GridView1_RowDataBound"
Width="100%" AllowPaging="true" BorderStyle="Solid" PagerSettings-Position="TopAndBottom">
<Columns>
<asp:TemplateField HeaderText="Last" >
<ItemStyle VerticalAlign="Top" />
<ItemTemplate>
<%#Eval("Last")%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="First" >
<ItemStyle VerticalAlign="Top" />
<ItemTemplate>
<%#Eval("First")%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Supervisor ID" >
<ItemStyle VerticalAlign="Top" />
<ItemTemplate>
<%#Eval("supervisorId")%>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Codebehind:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
// EdT: if there is no value in session["userId"], redirect user to login page
if ((HttpContext.Current.Session["userId"]) == null)
{
Response.Redirect("Default.aspx");
}
else
{
userName = SqlHelperClass.GetUserName((int)HttpContext.Current.Session["userId"]);
timeCard = new TimeCard((int)HttpContext.Current.Session["userId"], GetCurrentPayPeriod());
// EdT: Set value of literal
Literal1.Text = userName;
// EdT: Set default values for SelectParameters
string userId = HttpContext.Current.Session["userId"].ToString();
string pped = Convert.ToString(GetCurrentPayPeriod());
SqlDataSource1.SelectParameters["user"].DefaultValue = userId;
SqlDataSource1.SelectParameters["pped"].DefaultValue = pped;
}
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
// set value of dropdown list in GridView Row to the value contained in the timecard DataTable
if (e.Row.RowType == DataControlRowType.DataRow)
{
string dropDownListValue = CurrentTimeCard.TimeCardDataTable.Columns["projectName"].ToString();
DropDownList dropDownList = (DropDownList)e.Row.FindControl("DropDownList1");
dropDownList.DataSource = SqlDataSource2;
dropDownList.SelectedValue = dropDownListValue;
}
}
SqlDataSource1 markup:
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:MinnsTimeDatabase %>"
SelectCommand="spGetTimeCard" SelectCommandType="StoredProcedure" >
<SelectParameters>
<asp:Parameter Name="user" Type="Int32" />
<asp:Parameter DbType="Date" Name="pped" />
</SelectParameters>
</asp:SqlDataSource>
Any thoughts appreciated

You haven't mentioned what your actual problem is, but one issue I see is that you do not need to call DataBind() on a GridView when you are using the DataSourceID property (and thus a datasource control).
So I would definitely remove the call to GridView1.DataBind(); that is the else block of your Page_Load function. Since you are doing processing in the RowDataBound event, it's quite possible that the GridView databinding multiple times during the page life cycle is causing an issue.