Unable to cast object of type 'System.Web.UI.WebControls.TextBox' to type 'System.Web.UI.WebControls.Label'.

Question

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Hi,Is there any to get a boundField into a label...
I am using this code to get a boundFied row into a textbox and I want also to get the same into a Label but I am getting an error.
This is my code:

C#

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataKeyNames="CustomerID" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating">
                <Columns>
                    <asp:BoundField DataField="CompanyName" HeaderText="Company Name" />
                    <asp:BoundField DataField="Address" HeaderText="Sddress" />
                    <asp:BoundField DataField="City" HeaderText="City" />
                    <asp:BoundField DataField="PostalCode" HeaderText="PostalCode" />
                    <asp:BoundField DataField="Country" HeaderText="Country" />
                    <asp:CommandField ShowEditButton="true" />
                    <asp:CommandField ShowDeleteButton="true" />
                </Columns>
            </asp:GridView>

and this the c# code:

C#

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            int Customerid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());
            GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
            Label lblID = (Label)row.FindControl("lblID");
            TextBox textCompanyName = (TextBox)row.Cells[0].Controls[0];
            TextBox textAddress = (TextBox)row.Cells[1].Controls[0];
            TextBox textCity = (TextBox)row.Cells[2].Controls[0];
            TextBox textPostalCode = (TextBox)row.Cells[2].Controls[0];
            //string country = row.Cells[4].Text;
            Label lblCountry = (Label)row.Cells[4].Controls[0];
...
}

I am getting an error ont this line:

Label lblCountry = (Label)row.Cells[4].Controls[0];
Any help

Posted 23-May-13 0:42am

El Dev

Updated 5-Jun-18 2:37am

Thanks7872

v2

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Comments

Thanks7872 23-May-13 6:45am

where is label in your gridview? and whers textbox?

El Dev 23-May-13 6:56am

I dont need them in GridView I can create the in code behind Like this
TextBox textCompanyName = (TextBox)row.Cells[0].Controls[0];
and this work fine but when I am using this Label lblCountry = (Label)row.Cells[4].Controls[0]; it is not working...

2 solutions

Solution 1

The error is clearly telling you that you cannot convert an object of type A to an object of type B.
TextBox and Label are two different controls. You are type casting TextBox as a Label, in which case the error is obvious.
If you want to get the value of textbox and apply it to a label, then the following code would help.

var textBoxObj = (TextBox)row.Cells[4].Controls[0];
Label lblCountry = new Label(){ Text = textBoxObj.Text };

Posted 23-May-13 0:53am

pramod.hegde

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Zafar Sultan · Accepted Answer · 2013-05-23T00:55:00

Because on updating boundfields are converted into textboxes. First you will have to cast it as a textbox after that you can assign its value to any label.

Try replacing

C#

Label lblCountry = (Label)row.Cells[4].Controls[0];

with

C#

TextBox lblCountry = (TextBox )row.Cells[4].Controls[0];

Then you can have something like:

C#

Label myLabel = new Label();
myLabel.Text = lblCountry.Text.Trim();