How to add dropdownlist in gridview programetically

Question

1.00/5 (1 vote)

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I have load event as follow:

protected void Page_Load(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection("Data Source=.\\sqlexpress;Initial Catalog=testdb;Integrated Security=True;Pooling=False");
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter("select * from emp",con);
        DataSet ds = new DataSet();
        da.Fill(ds);
        GV_DataByGroupAct.DataSource =ds.Tables[0]; 
        GV_DataByGroupAct.DataBind();
    }

Have look of source view:

XML

<asp:GridView ID="GV_DataByGroupAct" runat="server" AutoGenerateColumns="true"
        onrowdatabound="GV_DataByGroupAct_RowDataBound">
        <Columns>

</Columns>
    </asp:GridView>

And GV_DataByGroupAct_RowDataBound event:

C#

protected void GV_DataByGroupAct_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            foreach (TableCell tc in e.Row.Cells)
            {
                dl = new DropDownList();
                dl.Items.Add("one");
                dl.Items.Add("two");
                dl.Items.Add("three");

                tc.Controls.Add(dl);
            }
        }

    }

As i run this it adds only dropdownlist control to the gridview.
I am just trying to add data from database as well as dropdownlist to each rows in a new column. Please suggest.

Posted 11-Nov-13 5:29am

Brijesh Kr

Updated 11-Nov-13 22:12pm

v3

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2 solutions

Solution 1

First of all, you should check IsPostBack property on Page_Load.

C#

protected void Page_Load(object sender, EventArgs e)
{
     If(!IsPostBack)
     {
        SqlConnection con = new SqlConnection("Data Source=.\\sqlexpress;Initial Catalog=testdb;Integrated Security=True;Pooling=False");
        con.Open();
        SqlDataAdapter da = new SqlDataAdapter("select * from emp",con);
        DataSet ds = new DataSet();
        da.Fill(ds);
        GV_DataByGroupAct.DataSource =ds.Tables[0]; 
        GV_DataByGroupAct.DataBind();
     }
}

In RowDataBound, you are looping for all cells, but you should only loop for the rows.
That may be the reason it is showing on all cells.

Posted 11-Nov-13 5:53am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

Brijesh Kr 12-Nov-13 4:10am

Would you give on sample?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 12-Nov-13 4:39am

Which sample? Do a Google search, you will find many.

Brijesh Kr 12-Nov-13 5:11am

Give any one which works?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 12-Nov-13 7:16am

As I said you the problem was " you were adding controls by looping for each cell". And that is wrong.
In your answer, you have eliminated it and added the control to a particular cell that is Cell 2.

That is what I was telling you. :)

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Brijesh Kr · Accepted Answer · 2013-11-11T23:14:00

Well do some thing like follow:
Only problem i think would be is performance degrade, isn't? anyone has some solution?

XML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
           DataKeyNames="EmpId" DataSourceID="SqlDataSource1"
           ondatabound="GridView1_DataBound">
           <Columns>
               <asp:CommandField ShowSelectButton="True" />

               <asp:BoundField DataField="EmpId" HeaderText="EmpId" ReadOnly="True"
                   SortExpression="EmpId" />
                   <asp:BoundField  HeaderText="Category" />
               <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
           </Columns>
       </asp:GridView>
       <asp:SqlDataSource ID="SqlDataSource1" runat="server"
           ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString %>"
           SelectCommand="SELECT * FROM [employee]"></asp:SqlDataSource>

C#

protected void Page_Load(object sender, EventArgs e)
   {
       if(IsPostBack)
       addControl();
   }
   void addControl()
   {

       foreach (GridViewRow row in GridView1.Rows)
       {
           if (row.RowType == DataControlRowType.DataRow)
           {
               DropDownList dl = new DropDownList();
               dl.Items.Add("One");
               dl.Items.Add("Two");
               row.Cells[2].Controls.Add(dl);
           }
       }
   }
   protected void GridView1_DataBound(object sender, EventArgs e)
   {

       addControl();
   }