How to retrieve specific column row from the database

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The Datasource of my Dropdownlist is one of the Columns in my database.i want to retrieve the column row which is selected in the dropdownlist ...in the Gridview.please help. #ASP.NET #c # gridview

What I have tried:

i am able to retrive the complete colum not thespecific rows

ASP.NET

<title>

#Select1
{
width: 197px;
}

<asp:DropDownList ID="DropDownList1" runat="server"
DataSourceID="SqlDataSource1" DataTextField="Album_name"
DataValueField="Album_name">
<asp:listitem>Lamborghini
<asp:listitem>BMW

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:iuploadaz %>"
SelectCommand="SELECT [Album_name] FROM [tb_Gallery]">
<asp:ScriptManager ID="ScriptManager1" runat="server">

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<asp:AnimationExtender ID="Button1_AnimationExtender" runat="server"
Enabled="True" TargetControlID="Button1">

<asp:GridView ID="gvsearch" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1" Width="305px">
<columns>
<asp:BoundField DataField="Album_name" HeaderText="Album_name"
SortExpression="Album_name" />


<asp:ListBox ID="ListBox1" runat="server" DataSourceID="SqlDataSource1"
DataTextField="Album_name" DataValueField="Album_name">

code:

C#

public partial class searchaz : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["iuploadaz"].ConnectionString);

protected void Page_Load(object sender, EventArgs e)
{

// Label3.Text = a.ToString();
}

protected void Button1_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand("select * from tb_Gallery", con);
// SqlDataAdapter da = new SqlDataAdapter(cmd);

// DataSet ds = new DataSet();
// da.Fill(ds, "album_name");
// DropDownList1.DataSource = ds;
// DropDownList1.DataTextField = "album_name";
//DropDownList1.DataBind();
SqlDataAdapter da = new SqlDataAdapter("select album_name from tb_Gallery where album_name like '" + DropDownList1.Text + "'", con);
//DataSet ds = new DataSet();
//da.Fill(ds);
//DropDownList1.DataSource = ds;
//DropDownList1.DataTextField = "album_name";
//DropDownList1.DataBind();
//gvsearch.DataSource = ds;
//gvsearch.DataBind();

}
}
}

Posted 1-May-18 3:42am

Member 13802222

Updated 1-May-18 4:24am

Wendelius

v3

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Comments

CHill60 1-May-18 9:43am

Show us the code you are using to retrieve "the complete column" and what you have tried so far for the specific row.
By the way - hashtagging doesn't work here ... you enter the tags as part of the initial post

Member 13802222 1-May-18 10:10am

<title>

#Select1
{
width: 197px;
}

<asp:DropDownList ID="DropDownList1" runat="server"
DataSourceID="SqlDataSource1" DataTextField="Album_name"
DataValueField="Album_name">
<asp:listitem>Lamborghini
<asp:listitem>BMW

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:iuploadaz %>"
SelectCommand="SELECT [Album_name] FROM [tb_Gallery]">
<asp:ScriptManager ID="ScriptManager1" runat="server">

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<asp:AnimationExtender ID="Button1_AnimationExtender" runat="server"
Enabled="True" TargetControlID="Button1">

<asp:GridView ID="gvsearch" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1" Width="305px">
<columns>
<asp:BoundField DataField="Album_name" HeaderText="Album_name"
SortExpression="Album_name" />

<asp:ListBox ID="ListBox1" runat="server" DataSourceID="SqlDataSource1"
DataTextField="Album_name" DataValueField="Album_name">

....
code:
public partial class searchaz : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["iuploadaz"].ConnectionString);

protected void Page_Load(object sender, EventArgs e)
{

// Label3.Text = a.ToString();
}

protected void Button1_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand("select * from tb_Gallery", con);
// SqlDataAdapter da = new SqlDataAdapter(cmd);

// DataSet ds = new DataSet();
// da.Fill(ds, "album_name");
// DropDownList1.DataSource = ds;
// DropDownList1.DataTextField = "album_name";
//DropDownList1.DataBind();
SqlDataAdapter da = new SqlDataAdapter("select album_name from tb_Gallery where album_name like '" + DropDownList1.Text + "'", con);
//DataSet ds = new DataSet();
//da.Fill(ds);
//DropDownList1.DataSource = ds;
//DropDownList1.DataTextField = "album_name";
//DropDownList1.DataBind();
//gvsearch.DataSource = ds;
//gvsearch.DataBind();

}
}
}

Wendelius 1-May-18 10:23am

When adding more information, use the "Improve question" link to edit the question

Member 13802222 1-May-18 11:19am

thanks.alright.

2 solutions

Solution 1

When you query a database, it returns all of the rows that fit your query's criteria. You therefore need a way to ask for only the rows or row that you're interested in.

The best way is to have an IDENTITY [^] column - and that is referred to as the value in your select list. Then you can pick that specific row and do what you want with it.

If it's by category, you need to mark your data in some manner whereby the category of each row is declared - then you can use the category as the value of your select list.

You can then, of course, request only the field or fields you are interested in.

Posted 1-May-18 3:56am

W∴ Balboos, GHB

Comments

Member 13802222 1-May-18 10:29am

thank you for replying.
how do i mark the data?

W∴ Balboos, GHB 1-May-18 10:33am

If your talking about each individual row, you can add a new field of type INT, and then, per the link I gave your, convert it to an IDENTITY field. It will automatically fill with sequenced numbers.

You can now select any record for any process by referring to this value in your WHERE clause. It will always return just that record as these values are NEVER repeated. You have to determine how your list knows which record identity to associate with each item. Fill the list via a query or hard-code it.

NOTE: if you find a answer that solves your question, mark it as accepted so it can be properly closed.

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Wendelius · Accepted Answer · 2018-05-01T04:22:00

First of all, do not concatenate data from controls to the SQL query. This leaves you open to SQL injection - Wikipedia[^] . The proper way is to use SqlParameter Class (System.Data.SqlClient)[^]

What comes to your query, I don't quite understand why you want to fetch the data you already have in the query below

C#

SqlDataAdapter da = new SqlDataAdapter("select album_name from tb_Gallery where album_name like '" + DropDownList1.Text + "'", con);

But if the idea is to use LIKE comparison, you probably want to have a wildcard somewhere. With parameters, something like

SqlDataAdapter da = new SqlDataAdapter("select album_name from tb_Gallery where album_name like @albumname + '%'", con);

For more information, see LIKE (Transact-SQL) | Microsoft Docs[^]

ADDITION
--------
To use a parameter you need to define it and provide a value for it. For example
...

C#

SqlDataAdapter da = new SqlDataAdapter("select album_name from tb_Gallery where album_name like @albumname + '%'", con);
da.SelectCommand.Parameters.Add(
    "@albumname ", SqlDbType.VarChar, 100).Value = DropDownList1.Text;
....