How to add header columns in gridview based on SQL query ? ASP.NET C#

Question

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SQL-Server-2012

I have a gridview.I want to display QUERY RESULT in gridview header (columns) dynamically.Header shows based on SQL-QUERY. Here is my SQL-QUERY USE db_compiler SELECT Column_Name FROM tbl_field WHERE Table_Name='pak' For example it this return rows id,name,city then i want to these shows in gridview header. How can i do this

What I have tried:

ASPX

ASP.NET

<asp:Content ID="Content2" ContentPlaceHolderID="body" Runat="Server">
    <form id="form"  runat="server">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true" 
            onrowdatabound="GridView1_RowDataBound">
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" OnClick="load" Text="Button" />
    </form>
</asp:Content>

ASPX.CS

C#

 public void load(object sender, EventArgs e)
    {
        //string tbl_name = Session["value"].ToString();
        //string tbl_name = "new";
        string query = "USE db_compiler SELECT Column_Name FROM tbl_field WHERE Table_Name='pak'";
        SqlCommand cmd = new SqlCommand(query, cnn);
        DataTable dt = new DataTable();
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        cnn.Open();
        cmd.ExecuteNonQuery();
        adp.Fill(dt);
        for (int i = 0; i < query.Count(); i++)
        {
            DataColumn dc = new DataColumn(dt.Rows[i].ToString());
        }
      DataRow r = table.NewRow();
      GridView1.DataSource = table;
      GridView1.DataBind();
      cnn.Close();
}

It's giving me error

A column named 'System.Data.DataRow' already belongs to this DataTable.

Posted 16-Jun-16 23:31pm

Hameed Khan

Updated 17-Jun-16 0:36am

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Member 12586674 · Answer 1 · 2016-06-17T00:06:00

Solution 1

From what I understood, you want your gridview headers to be changed according to data that will be bind to to it.

Code Behind

C#

 string query = "USE db_compiler SELECT Column_Name FROM tbl_field WHERE Table_Name='pak'";
SqlCommand cmd = new SqlCommand(query, cnn);
DataTable dt = new DataTable();
SqlDataAdapter adp = new SqlDataAdapter(cmd);
adp.Fill(dt);

GridView1.DataSource = dt;
GridView1.DataBind();

ASPX

ASP.NET

<form  runat="server">
    <asp:gridview id="GridView1" runat="server" autogeneratecolumns="true">
    </asp:gridview>
</form>

Simply by doing this, whatever columns your query returns will be displayed as grid headers.

Posted 17-Jun-16 0:06am

Member 12586674

Updated 17-Jun-16 0:07am

v2

Comments

Sinisa Hajnal 17-Jun-16 6:30am

This would be true if his query doesn't return the values he needs to put into column as rows.

Hameed Khan 17-Jun-16 6:35am

Please check my comment

Hameed Khan 17-Jun-16 6:35am

Hi.Your provided answer give my this result img But i want output in this shape img and here is my sql table SQL-IMG

Member 12586674 17-Jun-16 6:37am

Not able to view the image

Hameed Khan 17-Jun-16 6:41am

I want this type of output http://i.imgur.com/6vlVo3I.jpg and here is my SQL image http://imgur.com/DtIsha8

Hameed Khan 17-Jun-16 6:43am

But your solution result give me this IMG

Hameed Khan 17-Jun-16 6:44am

I want this type of output IMG and here is my SQL image SQL-IMG

Sinisa Hajnal · Answer 2 · 2016-06-17T00:36:00

You have several obvious errors in the code.
1. your query is of type string so this line

C#

for (int i = 0; i < query.Count(); i++)

will loop for each character in the query. You need dt.rows.count here.
2. you create new column

C#

DataColumn dc = new DataColumn(dt.Rows[i].ToString());

but you don't specify the item to be read. You call ToString on the whole row which by default gives back the type (System.Data.DataRow) which you set as column name.
3. you are not adding that column into datatable.
This should be your final code:

C#

public void load(object sender, EventArgs e)
    {
        string query = "USE db_compiler SELECT Column_Name FROM tbl_field WHERE Table_Name='pak'";
        SqlCommand cmd = new SqlCommand(query, cnn);
        DataTable dt = new DataTable();
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        cnn.Open();
        cmd.ExecuteNonQuery();
        adp.Fill(dt);

        for (int i = 0; i < dt.Rows.Count(); i++)
        {
            DataColumn dc = new DataColumn(dt.Rows[i].Item["Column_Name "].ToString());
dt.Columns.Add(dc);
        }
      DataRow r = table.NewRow();
      GridView1.DataSource = table;
      GridView1.DataBind();
      cnn.Close();
}