How do I fill dropdownlist in gridview

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i'm trying to fill DropDownList in GridView

What I have tried:

i have this class to call StoredProcedure :

public class DropDownList_DataAccessLayer
{
public static void DDL(DropDownList DDl, string ProcedureName, SqlParameter SPParameter, string DDLText, string DDLValue, string TXT)
{
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection CON = new SqlConnection(CS))
{
SqlCommand CMD = new SqlCommand();
CMD = CON.CreateCommand();
CMD.CommandType = CommandType.StoredProcedure;

if (SPParameter != null)
{
CMD.Parameters.Add(SPParameter);
}

CMD.Connection = CON;
CMD.CommandText = ProcedureName;
CON.Open();
SqlDataReader RD = CMD.ExecuteReader();

DDl.DataSource = RD;
DDl.DataTextField = DDLText;
DDl.DataValueField = DDLValue;

DDl.DataBind();

ListItem li = new ListItem(" Please Select " + TXT, "-1");
DDl.Items.Insert(0, li);
RD.Close();
CON.Close();
}
}
}

in Pageloade i have this:

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

private void BindGridViewData()
{
int CenterCode = Convert.ToInt32(Request.QueryString["Center_Code"]);
GridView1.DataSource = ProjectDataAccessLayer.GetAllProjects(CenterCode);
GridView1.DataBind();
}

in GridView1_RowDataBound i have this :

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
DropDownList ActiveCenterDDL = (DropDownList)e.Row.FindControl("ddlEditCenters");
DropDownList NewActiveCenterDDL = (DropDownList)e.Row.FindControl("ddlNewCenters");

DropDownList_DataAccessLayer.DDL(ActiveCenterDDL, "Get_ActiveCenters", null, "CenterName", "CenterCode", "Center"); // for
DropDownList_DataAccessLayer.DDL(NewActiveCenterDDL, "Get_ActiveCenters", null, "CenterName", "CenterCode", "Center");

in aspx i have this :

<asp:TemplateField HeaderText="Centers" SortExpression="Center_Name">

<itemtemplate>
<asp:Label ID="lblCenterName" runat="server" Text='<%# Bind("Center_Name") %>'>

<edititemtemplate>
<asp:DropDownList ID="ddlEditCenters" CssClass="gvedit" runat="server" ValidationGroup="EditRow">
<asp:RequiredFieldValidator CssClass="Validator" ID="ddlEditCentersValidator" runat="server" ControlToValidate="ddlEditCenters" ErrorMessage="you didn't select a center" InitialValue="-1" ValidationGroup="Edit">*

<footertemplate>
<asp:DropDownList ID="ddlNewCenters" CssClass="gvfooter" runat="server">

Posted 23-Oct-16 13:09pm

Member 11918737

Updated 24-Oct-16 12:00pm

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Suvendu Shekhar Giri 23-Oct-16 23:13pm

What is the issue here?
Is it giving any error?

2 solutions

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Srinivas Kalabarigi · Answer 1 · 2016-10-24T00:48:00

Something like below example:

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if ((e.Row.RowState & DataControlRowState.Edit) > 0)
        {
            DropDownList ActiveCenterDDL= (DropDownList)e.Row.FindControl("ddlEditCenters");
            //bind dropdown-list
            DataTable dt = con.GetData("Select category_name from category");
            ActiveCenterDDL.DataSource = dt;
            ActiveCenterDDL.DataTextField = "category_name";
            ActiveCenterDDL.DataValueField = "category_name";
            ActiveCenterDDL.DataBind();

DropDownList NewActiveCenterDDL= (DropDownList)e.Row.FindControl("ddlEditCenters");
            //bind dropdown-list
            DataTable dt = con.GetData("Select category_name from category");
            NewActiveCenterDDL.DataSource = dt;
            NewActiveCenterDDL.DataTextField = "category_name";
            NewActiveCenterDDL.DataValueField = "category_name";
            NewActiveCenterDDL.DataBind();

            DataRowView dr = e.Row.DataItem as DataRowView;
            //ddList.SelectedItem.Text = dr["category_name"].ToString();
            ActiveCenterDDL.SelectedValue = dr["category_name"].ToString();
        }
    }
}

Vincent Maverick Durano · Answer 2 · 2016-10-24T12:00:00

Solution 2

If I understand correctly, you wanted to populate your DropDownList from within EditItemTemplate. If that's the case then this article should help you with that: ASP.NET GridView: Implementing Cascading DropDownList on Edit Mode[^]

Posted 24-Oct-16 12:00pm

Vincent Maverick Durano