How to compare datagridview cell value is empty in C# windows application

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I Have a form in that one bankname combobox,acountno textbox,accounttype combobox ,onedatagridview, and one Addbutton and Save button.
After Loading the form If i select bankname from the combobox accountno and accounttype
boxes are filling and showing the related bank details in datagridview fine.Add button is used for if select bankname and then i click add button new empty row is added top of the
datagridview and then i enter the data into row and the click save button.It saving database fine.Now what i want is if i add new new empty row and click save button it will message cell value is empty i tried different ways but it is not working .Please anybody
help me on this.I am getting compile time error operator != cannot be applied operands of the int and system.dbnull error

What I have tried:

C#

<blockquote class="quote"><div class="op">Quote:</div><pre>
<blockquote class="quote"><div class="op">Quote:</div>  


       private void btnsave_Click(object sender, EventArgs e)
        {
            ChqMngrBsns.CheckBook chk = new ChqMngrBsns.CheckBook();

            // Inserting Each Record into database

            foreach (DataGridViewRow row in dgvwChqs.Rows)
            {
                if (bankid > 0)
                {
                    chk.bankid=bankid;


                    if (Convert.ToInt32(row.Cells["Slno"].Value) != DBNull.Value)
                    {

                        chk.Slno = Convert.ToInt32(row.Cells["Slno"].Value);

                    }

                    if (Convert.ToInt32(row.Cells["startno"].Value) != DBNull.Value)
                    {
                        chk.startingno = Convert.ToInt32(row.Cells["startno"].Value);
                    }

                    if (Convert.ToInt32(row.Cells["noofcheques"].Value) != DBNull.Value)
                    {
                        chk.Noofcheques = Convert.ToInt32(row.Cells["noofcheques"].Value);
                    }

                    if (Convert.ToInt32(row.Cells["endingno"].Value) != DBNull.Value)
                    {

                        chk.Endingno = Convert.ToInt32(row.Cells["endingno"].Value);
                    }

                    if (Convert.ToBoolean(row.Cells["Status"].Value == DBNull.Value))
                    {
                        chk.status = false;

                    }

                    else if (Convert.ToBoolean(row.Cells["Status"].Value != DBNull.Value))
                    {
                        chk.status = true;

                    }
                    chk.SaveData(true);

                }
            }
            //Clearing the datatable
            cmbbankname.SelectedIndex = 0;
            txtAcntno.Text = "";
            cmbAcntype.SelectedIndex = 0;
            dts.Clear();
            //LoadDataGridView();
        }</blockquote>

Posted 18-May-17 0:51am

Member 13153537

Updated 18-May-17 1:26am

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Comments

CHill60 18-May-17 7:08am

Don't convert to an int before comparing to DBNull.Value. It's the Cell you are checking for null not the value within the cell.
Also avoid using Convert.To... use the Parse or TryParse methods on each type.

Member 13153537 18-May-17 7:14am

How to do that please tell me.I'm fresher.Thanks In Advance.

Member 13153537 18-May-17 7:15am

or Give me any reference.

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CHill60 · Accepted Answer · 2017-05-18T01:26:00

Something like this should get you over the problem (warning - untested)

C#

int atry;
if (row.Cells["Slno"].Value != null)
{
    if (int.TryParse(row.Cells["Slno"].Value.ToString(), out atry)) 
    {
        chk.Slno = atry;
    }
}

if (row.Cells["startno"].Value != null)
{
    if (int.TryParse(row.Cells["startno"].Value.ToString(), out atry)) 
    {
        chk.startingno = atry;
    }
}

if (row.Cells["noofcheques"].Value != null)
{
    if (int.TryParse(row.Cells["noofcheques"].Value.ToString(), out atry)) 
    {
        chk.Noofcheques = atry;
    }
}

if (row.Cells["endingno"].Value != null)
{
    if (int.TryParse(row.Cells["endingno"].Value.ToString(), out atry)) 
    {
        chk.Endingno = atry;
    }
}


if (row.Cells["Status"].Value != null)
{
    bool abtry;
    if (bool.TryParse(row.Cells["Status"].Value.ToString(), out abtry))
    {
        chk.status = abtry;
    }
    else
    {
        chk.status = false;
    }
}