//method to update data in our database from our application
public bool Update(contactClass c)
{
//create a default return type and set it to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
// Sql to update data in our database
string sql = "UPDATE TBL_Contact SET firstName = @firstName, lastname = @lastName, contactNo = @contactNo, address = @address, gender = @gender WHERE ContactID = @ContactID";
// Sql command
SqlCommand cmd = new SqlCommand(sql, conn);
//create parameters to add value
cmd.Parameters.AddWithValue("@firstName", c.firstName);
cmd.Parameters.AddWithValue("@lastName", c.lastName);
cmd.Parameters.AddWithValue("@contactNo", c.contactNo);
cmd.Parameters.AddWithValue("@address", c.address);
cmd.Parameters.AddWithValue("@gender", c.gender);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//open database connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfull rows will be greater than zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
// Inserting data into database
public bool Insert(contactClass c)
{
// creating a default return type and setting its value to false
bool isSuccess = false;
//step 1: Connect Database
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
// Step 2: create sql query to insert data
string sql = "INSERT INTO TBL_Contact(firstName, lastName, contactNo, address, gender) VALUES (@firstName, @lastName, @contactNo, @address, @gender)";
// creating sql command using sql and conn
SqlCommand cmd = new SqlCommand(sql, conn);
// create parameters to add data
cmd.Parameters.AddWithValue("@firstName", c.firstName);
cmd.Parameters.AddWithValue("@lastName", c.lastName);
cmd.Parameters.AddWithValue("@contactNo", c.contactNo);
cmd.Parameters.AddWithValue("@address", c.address);
cmd.Parameters.AddWithValue("@gender", c.gender);
//connection open here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfully then the value of rows will be greater than zero else it will be zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//method to delete data from database
public bool Delete(contactClass c)
{
//create a default return value and set it to false
bool isSuccess = false;
//create sql connection
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
// delete data
string sql = "DELETE FROM TBL_Contact WHERE ContactID = @ContactID";
//creating sql command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
// open Connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfully the value of rows will be greater than zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//close connection
conn.Close();
}
return(isSuccess);
}