Cannot implicitly convert type 'string' to 'System.Web.UI.WebControls.DropDownList'

Question

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TRYING TO SEND mail with document name and then value which admin select from dropdown like approve/reject/pending for this i try this code

C#

Label DocName = ((Label)Repeater2.Items[i].FindControl("DocName"));
DropDownList dropdownvalue =(DropDownList)Repeater2.Items[i].FindControl("lblvalue"));
Label Label2 = ((Label)Repeater2.Items[i].FindControl("Label2"));
string docname = String.Empty;
string dropdownvalues = String.Empty;
string emailId = String.Empty;

if (DocName.Text.ToString() != ""){
    docname = DocName.Text.ToString();
}else{
    docname = "Unavailable";
}

if (dropdownvalue.SelectedItem.ToString() != ""){
    dropdownvalues = dropdownvalue.SelectedItem.ToString();
}else{
    dropdownvalue = "Unavailable";
}

HTML:

ASP.NET

<td> 
  <asp:Label ID="lblvalue" runat="server" Text='<%# Eval("ApproveID") %>' Visible = "false" /> 
  <asp:DropDownList ID="DropDownList4" runat="server" EnableViewState="true" class="vpb_dropdown" DataTextField="ApproveType" DataValueField="ApproveID" AutoPostBack="true" OnSelectedIndexChanged="DropDownList4_SelectedIndexChanged">
    <asp:ListItem Text="Pending" selected="selected" Value="3">
    </asp:ListItem> 
    <asp:ListItem Text="Approve" Value="1">
    </asp:ListItem>
    <asp:ListItem Text="Reject" Value="2">
    </asp:ListItem> 
  </asp:DropDownList> 
</td>

but here occurs in this code

C#

dropdownvalue = "Unavailable";

Error Cannot implicitly convert type 'string' to 'System.Web.UI.WebControls.DropDownList'

Posted 24-Nov-13 2:03am

Diya Ayesa

Updated 24-Nov-13 2:05am

CHill60

v2

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3 solutions

Solution 1

Your inaptly named "dropdownvalue" is of type DropDownList which cannot be assigned a string. Did you mean

C#

dropdownvalue.SelectedItem.Value = "2" // Reject

In your DropDownList4 (again, can this have a better name, like DropDownApprovalStatus) has possible values of 1, 2 and 3 corresponding to "Approve", "Reject" and "Pending". I cannot see "Unavailable"...

Posted 24-Nov-13 2:14am

John Korondy

Updated 24-Nov-13 2:19am

v2

Comments

CHill60 24-Nov-13 8:17am

Sorry for the overlap!

Solution 2

dropdownvalue is a DropDownList object. You can't assign a string to it, that would be meaningless.
What you are actually trying to do is change the .Text displayed on the control, so try something like ...

C#

dropdownvalue.Text = "Unavailable"

.
Note this will only work if "Unavailable" is already in the list of items on the control. If it isn't there you will have to add it.

What I think you meant to do was say

dropdownvalues = "Unavailable";

Posted 24-Nov-13 2:16am

CHill60

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pradiprenushe · Accepted Answer · 2013-11-24T02:19:00

Solution 3

Type of dropdownvalue is DropDownList. So you can not set string to dropdownlist.
I think you user wrong variable.
Try this

C#

if (dropdownvalue.SelectedItem.ToString() != ""){
    dropdownvalues = dropdownvalue.SelectedItem.ToString();
}else{
    dropdownvalues = "Unavailable";
}

Posted 24-Nov-13 2:19am

pradiprenushe