System.InvalidCastException: Specified cast is not valid In gridview

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I have facing problem when gridview is empty then show only footer part.

C#

private void FillCustomerInGrid()
    {
        gvGroupList.DataSource = AdminService.SelectGroupUsergrid();
        gvGroupList.DataBind();
        int rowCount = gvGroupList.Rows.Count;
        if (rowCount == 0)
        {
            DataTable dt = new DataTable();
           dt.Columns.Add("Id");
            dt.Columns.Add("Group_Name");
            dt.Columns.Add("emp_name");
            dt.Columns.Add("emp_Id");
            dt.Columns.Add("Email_Requriment");
            DataRow dr = dt.NewRow();
            dt.Rows.Add(dr);
            gvGroupList.DataSource = dt;
            gvGroupList.DataBind();
            gvGroupList.Rows[0].Visible = false;

        }
    }

But the problem is happening when in

HTML

<itemtemplate>
    <asp:CheckBox ID="chkEmailReq" runat="server" Checked='<%#Eval("Email_Requriment") %>'
    Enabled="false" />
</itemtemplate>

Then it gives error --

System.InvalidCastException: Specified cast is not valid

please help me

Posted 6-Apr-12 23:35pm

piushshukla

Updated 19-Apr-12 23:04pm

walterhevedeich

v2

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4 solutions

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Technoses · Answer 1 · 2012-04-20T01:25:00

Solution 5

You can use TemplatField and try this:

HTML

<input type="checkbox" id="Checkbox1" <%# Convert.ToBoolean(Eval("Email_Requriment"))==true?"checked" : "" %> />

Posted 20-Apr-12 1:25am

Technoses

AmitKumar89 · Answer 2 · 2012-04-19T23:45:00

Hi,

Try this:

C#

private void FillCustomerInGrid()
    {
        gvGroupList.DataSource = AdminService.SelectGroupUsergrid();
        gvGroupList.DataBind();
        int rowCount = gvGroupList.Rows.Count;
        if (rowCount == 0)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Id");
            dt.Columns.Add("Group_Name");
            dt.Columns.Add("emp_name");
            dt.Columns.Add("emp_Id");
            dt.Columns.Add("Email_Requriment");
            dt.Rows.Add("", "", "", false);
            gvGroupList.DataSource = dt;
            gvGroupList.DataBind();
            gvGroupList.Rows[0].Visible = false;
 
        }
    }

I hope this will work for you..

Herman<T>.Instance · Answer 3 · 2012-04-19T23:34:00

You are trying to cast a NULL to a boolean.
Your code :

C#

DataRow dr = dt.NewRow();
            dt.Rows.Add(dr);

this means dr["Email_Requriment"] is DBNull.Value so set

C#

dr["Email_Requriment"] = false;

before you do:

C#

dt.Rows.Add(dr);

and like Praveen says:

C#

dt.Columns.Add("Email_Requriment", typeof(bool));

Praveen Meghwal · Answer 4 · 2012-04-19T23:33:00

Add data types to the columns, by default it is string as

C#

private void FillCustomerInGrid()
        {
            gvGroupList.DataSource = AdminService.SelectGroupUsergrid();
            gvGroupList.DataBind();
            int rowCount = gvGroupList.Rows.Count;
            if (rowCount == 0)
            {
                DataTable dt = new DataTable();
                dt.Columns.Add("Id");
                dt.Columns.Add("Group_Name");
                dt.Columns.Add("emp_name");
                dt.Columns.Add("emp_Id");
                dt.Columns.Add("Email_Requriment", typeof(bool));
                DataRow dr = dt.NewRow();
                dt.Rows.Add(dr);
                gvGroupList.DataSource = dt;
                gvGroupList.DataBind();
                gvGroupList.Rows[0].Visible = false;
            }
        }

Regards
Praveen

System.InvalidCastException: Specified cast is not valid In gridview

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