How to compare gridview textbox oldvalue to newvalue before updating values in c# asp.net?

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Hello,

How to compare gridview textbox oldvalue to newvalue before updating values in c# asp.net?
I am using this code for updating value of gridview.

C#

protected void GVStartCampaignDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
TextBox txtAmountValue = (TextBox)GVStartCampaignDetails.Rows[e.RowIndex].FindControl("txtGVSCAmountValue");

SqlConnection con = new SqlConnection(connectionString);
                con.Open();
                SqlCommand cmdUpdateAllowtedCardNo = new SqlCommand("procUpdateAmount", con);
                cmdUpdateAllowtedCardNo.CommandType = CommandType.StoredProcedure;
                cmdUpdateAllowtedCardNo.Parameters.Add("@EmailId", SqlDbType.NVarChar).Value = EmailId;
                cmdUpdateAllowtedCardNo.Parameters.Add("@Amount", SqlDbType.Int).Value = Convert.ToInt32(txtAmountValue.Text);
cmdUpdateAllowtedCardNo.ExecuteNonQuery();
                con.Close();</pre>
GVStartCampaignDetails.EditIndex = -1;
}

how to compare txtAmountValue OldValue to NewValue before update procedure?

Please help me.

Thanks in Advance.

Ankit Agarwal
Website Developer

Posted 10-Jan-14 0:00am

ankit.agg1984

Updated 10-Jan-14 0:37am

Gitanjali Singh

v2

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Karthik_Mahalingam 10-Jan-14 6:04am

by comparing what will you do ?

[no name] 10-Jan-14 6:07am

I want to compare from Gridview Amount Cell Value, which already filled in the cell.
When i write new value in Amount cell, so my amount should not be greater then already filled amount value.

2 solutions

Solution 1

You have to use GridViewUpdatedEventArgs.OldValues Property[^].

Quote:
Gets a dictionary that contains the original field name/value pairs for the updated record.

Posted 10-Jan-14 0:06am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Karthik_Mahalingam · Accepted Answer · 2014-01-10T00:08:00

Do like this,
Add a template field with a hidden field and bind the amount value to it.
whenever you are updating the particular row, you can read the old value from that row's hidden field. and new value from the text box ,
then you can compare the both.
if both are different you can update the data else ignore it...

sample code:

C#

TextBox txtAmountValue = (TextBox)GVStartCampaignDetails.Rows[e.RowIndex].FindControl("txtGVSCAmountValue");
                HiddenField hdfldGVSCAmountValue = (HiddenField)GVStartCampaignDetails.Rows[e.RowIndex].FindControl("hdfldGVSCAmountValue");
                double oldvalue, newvalue;
                double.TryParse(txtAmountValue.Text, out newvalue);
                double.TryParse(hdfldGVSCAmountValue.Value, out oldvalue);

                if (newvalue >= oldvalue) // your custom conditions here
                {
                    // do something
                }